Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c2326ef4c38aa26…

MALICIOUS

PDF

81.8 KB Created: 2021-03-24 20:51:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: ba6c013cca42668e981bfed76e436f1b SHA-1: ef3bd84e68fab0c502ab1461655b576d222c0aba SHA-256: 8c2326ef4c38aa2613a84c55e3e08712fcefe305611e89361070d1a02a0dfcc8
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 domains and potentially malicious content, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are likely used to redirect users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://fokemale.ru/123?utm_term=bimanual+examination+procedure PDF link annotation
    • http://parhelifrl.space/868443604090p1th.pdfIn PDF document text
    • http://my-favshop.online/788900845379eifv.pdfIn PDF document text
    • https://febavezexiwajo.weebly.com/uploads/1/3/4/7/134703432/42352.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460247/normal_5fe23e31996bf.pdfIn PDF document text
    • http://lnstagram-helps-contact.com/79813618555c2oz4.pdfIn PDF document text
    • http://copyrightsupporthelpcenter.com/how_much_do_air_conditioning_technicians_makeldgyt.pdfIn PDF document text
    • https://fekamudubop.weebly.com/uploads/1/3/5/3/135325245/3576292.pdfIn PDF document text
    • http://confirmyourverifiedbadge.com/91447460616my3h2.pdfIn PDF document text
    • http://good-production18.site/geometry_worksheet_angles_of_polygons_review_answers60q9s.pdfIn PDF document text
    • http://housefashion.ru/nuguxelebusimevebimivijntm6u.pdfIn PDF document text
    • http://instofficial.online/wolufaweb9e33o.pdfIn PDF document text
    • http://buytoday.cc/dd_monster_manual_3d_modelsw7695.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486193/normal_60554c951d31a.pdfIn PDF document text
    • http://fullhp.info/959206695066365u.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8458b573-1d6d-478c-912c-b10a972f31df.filesusr.com/ugd/150112_d2e00116c65e4f53a6c00aa70c33b430.pdf?index=trueIn PDF document text
    • https://36425c1f-c329-48aa-845d-1f8252cb45c8.filesusr.com/ugd/01d500_2b060f7b3be142fe9d4ae135cd966e80.pdf?index=trueIn PDF document text
    • https://97d49ff2-d914-4ae4-8ac8-5e5cf5f77cad.filesusr.com/ugd/6350c7_00641ef2a9fe45cc827d4940ff5a62d0.pdf?index=trueIn PDF document text
    • https://80c8fd16-4cf8-4f9f-b52b-d6c956df8f3b.filesusr.com/ugd/1a94e8_cd6604b78a4e49adacdcf031a4d5d033.pdf?index=trueIn PDF document text
    • https://5071cc05-3fa2-46b1-b944-d2523ca4b51d.filesusr.com/ugd/62e2c1_b2579cf374054e87978cff08b3b5c5b6.pdf?index=trueIn PDF document text
    • https://9f9bd9fa-00fe-4673-b34e-9a629881f524.filesusr.com/ugd/09273f_1a5755580da140ecacfd546bb70721f4.pdf?index=trueIn PDF document text
    • https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_1855bcf30a5f4fbeacd4b2a0fb638b09.pdf?index=trueIn PDF document text
    • https://aabf49e0-5477-4fd2-8456-a986ef8f2a87.filesusr.com/ugd/9e14ca_39b382183b094fa98fc730877b2f5798.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_off000102a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A5 5160 bytes
SHA-256: c2c57980a959280f2b10f72168ad9f160f6e1ab6728663fd9de9c6200e406e37
font_01_sfnt_off00011417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11417 11124 bytes
SHA-256: b8a081856b4af351104b7c57b108a547784e8d6668614ddb132e7b77a83ebd07