Malicious PDF — malware analysis report

Static analysis result for SHA-256 04290b1d8a80d882…

MALICIOUS

PDF

103.2 KB Created: 2021-04-20 05:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d023d9a2b4605bad0b2bf69378f08d66 SHA-1: 6e001c6b7a0008039a0c57a72804c06184f87fdf SHA-256: 04290b1d8a80d882a50355b04c2f580ac12bd78c29befa44d2c8e5fd4368272d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • 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 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://kuzutuzo.ru/strik?utm_term=how+to+write+a+good+book+review+ks3 PDF link annotation
    • http://ruvikuvi.mywebcommunity.org/80354606474.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369774/normal_5fdf614236cad.pdfIn PDF document text
    • http://larebalin.mypressonline.com/the_warrior_diet_food_list.pdfIn PDF document text
    • http://xejepurefe.scienceontheweb.net/zemipakomajafoge.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411479/normal_6005d99d6f3cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383566/normal_5feaf3249e16b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/46547570419.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88b59224-d818-4ef9-82f5-f6c40b6a19d7/rodogewugukotewabi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa53ce7c-2dc8-4321-950e-0a0e16c89b4b/31951759268.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93a2ae8c-21fc-4190-b8b6-03ba92b9f9d6/annual_salary_for_masters_in_psychology.pdfIn PDF document text
    • http://wuxosalilujaza.atwebpages.com/objectives_of_berlin_conference.pdfIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/vadeluragozalujoloropevuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/025867e9-c1d4-4fb7-a75e-9de9a83e39b1/how_do_you_reset_a_bluetooth_speaker.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/what_does_boss_lady_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/bad_boy_hd_wallpapers_apk.pdfIn PDF document text
    • http://fogokenum.onlinewebshop.net/ielts_semi_formal_letter_sample.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/216a7b8d-a5fd-493e-85ac-0228efdca6cb/what_is_detriment_in_contract_law.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d7eb1ff-ab4a-4cdc-b88c-76ba54fb0de3/how_to_check_voicemail_on_avaya_office_phone.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_off00013e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E5F 5444 bytes
SHA-256: 0611c46411900fe4511bb2360d35b882010508456d4dd49da470e5e0c8a78d02
font_01_sfnt_off00015104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15104 11916 bytes
SHA-256: b8545778787c72ed01da1e268fbc62ed3d80c02b67317b120e6069f6c2d4000d
font_02_sfnt_off000179e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179E9 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449

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