Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a1baf4f5601ff0…

MALICIOUS

PDF

98.6 KB Created: 2021-05-31 02:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d20e325dee620c2ef153e3b9d3d7813d SHA-1: efcb8a47ed3a5188f86ab55b05fccc1e171c7702 SHA-256: 37a1baf4f5601ff0f5b0c675862b9189733d6664416eb6ac18c5da1057dfcffc
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM indicate a large number of outbound links designed to manipulate search engine rankings or direct users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or spam distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jumiwimov.ru/123?utm_term=up+icds+anganwadi+form+2019 PDF link annotation
    • https://fixaninupokawaw.weebly.com/uploads/1/3/0/8/130873986/jexorusalon_wezaluwod_bifamowis_pigetinumesag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419433/normal_5ffb1cae2fe7f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4504839/normal_5fc5cd61705f8.pdfIn PDF document text
    • https://guvoxokogavi.weebly.com/uploads/1/3/4/3/134374443/2bb50c7.pdfIn PDF document text
    • https://widosutolitidaf.weebly.com/uploads/1/3/4/8/134847614/baleru.pdfIn PDF document text
    • https://kunokepipadiri.weebly.com/uploads/1/3/3/9/133997431/kaperarezotom.pdfIn PDF document text
    • https://jipunone.weebly.com/uploads/1/3/5/3/135349916/6273387.pdfIn PDF document text
    • https://bupiwuzisulim.weebly.com/uploads/1/3/0/8/130874125/wefamin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405413/normal_604b245f2b963.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465691/normal_604fff9c2ad8f.pdfIn PDF document text
    • https://pudewufaziv.weebly.com/uploads/1/3/0/7/130739775/2211568.pdfIn PDF document text
    • https://jopixedojowagi.weebly.com/uploads/1/3/4/8/134852439/xanojeralez-difafa-mikug.pdfIn PDF document text
    • https://rukepeninosiwul.weebly.com/uploads/1/3/1/4/131406291/3892231.pdfIn PDF document text
    • https://wanomumopanud.weebly.com/uploads/1/3/1/3/131379193/mesojodotigam_gutiwasos_kusetirov_josepikeg.pdfIn PDF document text
    • https://sotemupavunu.weebly.com/uploads/1/3/1/4/131413148/nuzaba.pdfIn PDF document text
    • https://motonolezigit.weebly.com/uploads/1/3/2/8/132814123/34996a39ff439f.pdfIn PDF document text
    • https://bemilinup.weebly.com/uploads/1/3/4/3/134390274/kirativerolaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/aae3f3a5-4993-469d-8712-dd4a8d18e92b/pubasewakusale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae426304-4fd3-4e42-a99c-2429cfd4737d/18041684625.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e781bff-4cd3-4313-b281-7be817f7357e/lumedeki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88cc8c3e-9ebd-43e7-8104-29831c691de0/how_to_reference_another_sheet_using_indirect.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24bb07f2-4555-41a0-99ef-f9d9b911dca3/sena_20s_evo_speaker_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96fc1cc5-cd04-47bb-bce0-2a392d75e21c/joxofidizunutopesobasojut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/958e41c0-614f-41df-8cc3-a795a11be31d/sovuxezaxebewex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/791793b9-1715-4c9e-a46c-307427230e1f/how_do_i_do_a_channel_scan_on_my_toshiba_tv.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA7 6008 bytes
SHA-256: 5358e81b0476e80df5d2137db9cedd3f9bb94befc2fe77838815582deb952387
font_01_sfnt_off00011f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F19 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off00012a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7C 11124 bytes
SHA-256: fd33a5b43498e79249b4b33eecaf66903c0ebdfea0bb0c7f127b21a92336e9f0
font_03_sfnt_off000150a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150A0 14820 bytes
SHA-256: 1e73d3fd45be9666f5564d4ece43414b478c6aa58a76990fd0c614d49a04a0e7

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