Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b93c6949cfa64c…

MALICIOUS

PDF

75.9 KB Created: 2021-02-26 00:34:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b8c896cbf9fb299123f803c7ab760c0c SHA-1: 82f6f6f7a1f2646d4558e6c0945470d049d04cc8 SHA-256: b9b93c6949cfa64c97568e76855195939d12de73c56d4d8d4d8b574ea21c61b8
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious content.

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://jottigo.ru/award?keyword=coleman+powermate+1850 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4477139/normal_602b99a8a3c37.pdfIn PDF document text
    • https://wiruwopifezub.weebly.com/uploads/1/3/4/3/134345133/ec58867cbcb67.pdfIn PDF document text
    • http://fejukoturig.medianewsonline.com/cyrano_de_bergerac_quotes_francais.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497358/normal_601bace7962aa.pdfIn PDF document text
    • https://sudarotabodubig.weebly.com/uploads/1/3/1/4/131407445/rupodefasijozeb_zukidedu.pdfIn PDF document text
    • https://dutaveporope.weebly.com/uploads/1/3/4/6/134600224/46d151cd9a8c0.pdfIn PDF document text
    • http://gapagal.mywebcommunity.org/sinaxemeguriterusozivado.pdfIn PDF document text
    • https://mejotowud.weebly.com/uploads/1/3/0/9/130969644/komererelizod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476582/normal_5fc7f3bbf1ba1.pdfIn PDF document text
    • https://naketutetan.weebly.com/uploads/1/3/4/6/134660231/duguzakeporus.pdfIn PDF document text
    • http://xorabawik.medianewsonline.com/how_much_does_a_semi_mechanic_make.pdfIn PDF document text
    • http://gratoram.site/mamitizutofultjqck.pdfIn PDF document text
    • https://mowolonob.weebly.com/uploads/1/3/4/8/134874237/namebi-mumaje-sexas.pdfIn PDF document text
    • https://lilawowawumoxo.weebly.com/uploads/1/3/1/4/131453384/vobepi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417536/normal_5ffa8a52856bd.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/welanisowari/angular_8_login_form_example.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/graylog_installation_guide_centos_7.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/gowebilivogugeweruzamep.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_off0000ed48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED48 5296 bytes
SHA-256: 24fdf0ae11b254a2147d4e1517e76cd1684d88f48f8134105531d5553dc0f7b5
font_01_sfnt_off0000ff46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF46 10344 bytes
SHA-256: cffa29e94e37e8d885735e2a36424010903d6916cd5b279c7157aac6a4306c88

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