Malicious PDF — malware analysis report

Static analysis result for SHA-256 810581ad839ed5d2…

MALICIOUS

PDF

97.4 KB Created: 2021-03-02 04:08:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b14d02d96ac7e8ef31a2e946716f83e1 SHA-1: 6dbd6166e453bb5542c4f40d51558b6a3efe6439 SHA-256: 810581ad839ed5d26055361b02a00483d4364c5a85f73d88d833247bc4414d37
126 Risk Score

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://gimoguvi.ru/strik?utm_term=the+secret+of+underground+medicine+review PDF link annotation
    • https://cdn.sqhk.co/purorelaz/eljagdP/how_to_make_crafting_table_pocket_edition.pdfIn PDF document text
    • http://kinorio5.xyz/1640078702fgdi6.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeform.com/87225198889ko77i.pdfIn PDF document text
    • https://cdn.sqhk.co/vumivatuvi/axigdje/history_of_african_american_music_in_10_minutes.pdfIn PDF document text
    • http://dixojele.22web.org/template_powerpoint_2018.pdfIn PDF document text
    • http://sun-italy.space/fotupojog8qyjs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368740/normal_5fee2e7ecc4c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473656/normal_5fd81e83a50c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369191/normal_602303e1870cb.pdfIn PDF document text
    • http://axecheat8.xyz/hepatitis_alcohol_symptomsy60le.pdfIn PDF document text
    • https://cdn.sqhk.co/joziroluxu/hdjhz3y/ninja_vegetable_smoothie_recipes.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/timituvupame/music_sheet_direct.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/xonivamuviferujir.pdfIn PDF document text
    • http://merofis.epizy.com/51585396380.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/wigovoxugasuwulenowuzaxe.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000138eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138EB 5296 bytes
SHA-256: 2106a5857b0369dd0a91c88e72b4fc2bda5e9fbf764848218de071ad3d134690
font_01_sfnt_off00014adb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ADB 16048 bytes
SHA-256: 9d411a6bce69bdbf7d9eede8c113c1685c40660fa525b3dd8c4b87fd0e9c97ec