Malicious PDF — malware analysis report

Static analysis result for SHA-256 66e12782fa484a2a…

MALICIOUS

PDF

75.4 KB Created: 2021-03-16 20:44:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 25bef869e9bd7c406414ac3b7a4107ad SHA-1: 55340b7480ac03462c8ab4be2f59e2b6a39a545c SHA-256: 66e12782fa484a2a3271bd1876a5bcc80dd23bf0b889b892db65cbd167e0db85
186 Risk Score

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 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/wix?keyword=fighting+stances+for+right+handed PDF link annotation
    • https://cdn.sqhk.co/gikunixa/jgfhbtO/glacier_national_park_backpacking_trails_map.pdfIn PDF document text
    • https://rogusedi.weebly.com/uploads/1/3/4/4/134433103/jerodu.pdfIn PDF document text
    • https://vedagerirujo.weebly.com/uploads/1/3/6/0/136055295/4409587.pdfIn PDF document text
    • https://cdn.sqhk.co/zatugudaxaji/Sscnyra/monodixozanodi.pdfIn PDF document text
    • https://cdn.sqhk.co/pemenodisoda/eje3J5B/34418116328.pdfIn PDF document text
    • https://cdn.sqhk.co/gimiraxu/cjhgg7e/2020_solar_eclipse_path_of_totality.pdfIn PDF document text
    • http://takodevizol.iblogger.org/97827841262.pdfIn PDF document text
    • https://tadonajates.weebly.com/uploads/1/3/4/3/134319020/c02ecbe4dc4.pdfIn PDF document text
    • https://cdn.sqhk.co/tevunufoba/AgciEhg/79518706764.pdfIn PDF document text
    • https://sakafafemowuva.weebly.com/uploads/1/3/4/6/134694971/pavunuwu-wutusesumi-sezapajamixubuw.pdfIn PDF document text
    • https://rinejadujasale.weebly.com/uploads/1/3/0/7/130775071/5396377.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jewomegoka.epizy.com/dungeon_masters_guide_3.5.pdfIn PDF document text
    • http://wapofele.epizy.com/duparopofeditekapeziwon.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/acord_forms_auto_id_card.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/86473098186.pdfIn PDF document text
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_370970d2bc0742289b0c3df5e4241e7f.pdf?index=trueIn PDF document text
    • https://05e27880-d5e1-4d3d-8428-ba943e9300bc.filesusr.com/ugd/b56239_f399211425f242c787c3452d87c1202e.pdf?index=trueIn 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_off0000e9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DE 5208 bytes
SHA-256: ce7960538c4bbfa2c13ce519a3fc486bdc917ff7ce0b1ed199394abffb8afe14
font_01_sfnt_off0000fb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB97 11268 bytes
SHA-256: 1bf08f0f4e385364965bcd3a44ac67a243a7578e6036ea5e18496ded54a253d2

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