Malicious PDF — malware analysis report

Static analysis result for SHA-256 118940ca2e3829fa…

MALICIOUS

PDF

90.6 KB Created: 2021-05-26 22:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7f7d03b003bf14ee42eac39821401e88 SHA-1: 998d3d78ff8b328bf51a19119e0dca8eb8783f4c SHA-256: 118940ca2e3829fa2bd0f8f28b0d780549e3ded855609be60bdb6d258f688c75
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/strik?utm_term=libros+en+ingles+para+nivel+intermedio+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4483075/normal_600a97a8e8491.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448540/normal_605acf39af097.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449185/normal_5fd8d1c18abaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385427/normal_5fc5cba411735.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490272/normal_5fd79c9908e95.pdfIn PDF document text
    • https://fotapudugibinok.weebly.com/uploads/1/3/4/8/134899903/7738542.pdfIn PDF document text
    • https://fijozemubo.weebly.com/uploads/1/3/4/2/134234573/xirele.pdfIn PDF document text
    • https://gapemudumowew.weebly.com/uploads/1/3/1/4/131437765/4989116.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409110/normal_60669570778bd.pdfIn PDF document text
    • https://marelepo.weebly.com/uploads/1/3/0/7/130738501/009b21.pdfIn PDF document text
    • https://rifijilaguselud.weebly.com/uploads/1/3/4/8/134846829/6829707.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450870/normal_605be6c31b9b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417119/normal_60334be95c165.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a959f40-f7a8-4611-8a77-9cc77fe492af/nizikukezisitizoxuxup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84f6c991-d045-4775-98a3-c3d6aca366fc/detijofemidujili.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b24f3ae4-562b-4b79-8be6-b517438bdad7/do_you_need_speakers_for_audio_technica_lp60x.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/474411c8-8138-4876-923b-fdc8b6df7efe/how_to_clean_honeywell_hcm-350.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d096caa8-6af2-4363-bc80-403c4198898d/mercury_150_efi_poppet_valve.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B95 5500 bytes
SHA-256: 3c469ea81bdc626266b4f0d97af1a4b3733f87c974e18982ba219320a0db089d
font_01_sfnt_off00011e3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3A 12476 bytes
SHA-256: f56b87207976c380fbc4992a098644b78156efd89c2a6e2df3320ef4b632545a
font_02_sfnt_off00014707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14707 16376 bytes
SHA-256: 684a3c196e802b4dc45ee85e0d12f41c83d6b6c6a55a83cec5fb8e332ee9aa36

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