Malicious PDF — malware analysis report

Static analysis result for SHA-256 8857cc0cda322c37…

MALICIOUS

PDF

77.5 KB Created: 2021-04-01 17:33:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 4596f732ead4394d87df405f01fc9d32 SHA-1: 051538e4f4ef4d4915d325c5d05186a7142ff90a SHA-256: 8857cc0cda322c37b00815d5e053c29a0719844c4ab793a16c0a4f1d81bfb03b
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting services, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs and the heuristic findings of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM point towards a campaign to drive traffic to malicious sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/strik?utm_term=adobe+illustrator+cc+classroom+in+a+book+2015+lesson+files PDF link annotation
    • https://gofolepoxi.weebly.com/uploads/1/3/4/8/134882907/novovujam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444095/normal_606480e1ad7da.pdfIn PDF document text
    • https://tozusasulinun.weebly.com/uploads/1/3/4/8/134872335/fomex_fuzibowofosipa_nusirap_zepidaserin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389365/normal_6009d1c971464.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489255/normal_5fe5b3d1a146a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469374/normal_60472a8c9212e.pdfIn PDF document text
    • http://nosaxumuv.iblogger.org/catechism_for_first_holy_communion.pdfIn PDF document text
    • https://xegafifa.weebly.com/uploads/1/3/0/7/130776616/6280902.pdfIn PDF document text
    • http://gotuxeloso.22web.org/lyman_shotshell_reloading_handbook_4th_edition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459478/normal_5fd6d4fa8708c.pdfIn PDF document text
    • https://zeduxuvanoripi.weebly.com/uploads/1/3/0/7/130775880/kigubilise.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/3c267b31-f971-4cf5-a222-64bcad614630/25503366355.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a29960e-79f9-420e-b552-de70f6e76eea/rowufi.pdfIn PDF document text
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_e00fb268f728427f9cf9c77eb11201d6.pdf?index=trueIn PDF document text
    • http://juzuruwe.rf.gd/arduino_programmable_boost_converter.pdfIn PDF document text
    • http://noxofovamoz.epizy.com/aces_high_tab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cced3103-533a-4b26-9343-3fb18a56d896/dragon_ball_manga.pdfIn PDF document text
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_e5250b1e585e4ed09a9e58c579f661fe.pdf?index=trueIn PDF document text
    • http://mulozeraxepe.epizy.com/active_and_passive_voice_quiz_answer_key.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_off0000ed1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1A 5812 bytes
SHA-256: 7508806be2ecff26548268f80d34a8952a7a87d97cec869f04181f4f100c9445
font_01_sfnt_off000100d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D6 11776 bytes
SHA-256: 055ddff4f46bdf8a68bed65c89caba44f3071b76aa0982e53e8f6e1fbfc0b434

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