Malicious PDF — malware analysis report

Static analysis result for SHA-256 be676e3cc9e3b280…

MALICIOUS

PDF

92.7 KB Created: 2020-12-23 13:49:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 2c9e416f624c00f3e64f9f344a4ba9a6 SHA-1: eed34131062aa9fba4a21370081725e319acc553 SHA-256: be676e3cc9e3b2807ce5ebcb00b0701d8936991224640b1d16f965de6408092e
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 pointing to disposable hosting, and one specific URL with a UTM term that suggests a phishing or SEO manipulation lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a downloader or redirector used in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffset.ru/strik?utm_term=tiana+toys+journey+adventures PDF link annotation
    • https://petabururumeje.weebly.com/uploads/1/3/4/9/134902787/d99f9f213.pdfIn PDF document text
    • https://botofemuko.weebly.com/uploads/1/3/4/8/134891122/luker.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408875/normal_5fe2c0c22f4cf.pdfIn PDF document text
    • https://bigonokefexix.weebly.com/uploads/1/3/4/5/134518339/misolezawaxowo-luponi-wibekujiwupos-logelitufinodag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445116/normal_5fa18599b20e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365576/normal_5fd8685d14733.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403563/normal_5fd7285f57c5c.pdfIn PDF document text
    • https://zokemubolito.weebly.com/uploads/1/3/4/8/134895641/9678b5ca9f.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/tokudapele/uti_sepsis_treatment_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/fundamental_of_computer_in_hindi_for_pgdca.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/mercury_25_hp_4_stroke_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26615bff-d9fd-46e9-ba7d-bac1997365cf/north_face_apex_flex_dryvent.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63dd7d96-d8e9-4c7d-89bd-ca192c700db8/71680286307.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a75457eb-7796-45c0-b246-d07c4a4eee55/elko_high_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49d92eed-0329-4022-ad06-0ea66f3990e6/bravelands_book_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/778ac600-2878-41ba-9ade-9904f2d8ef46/mafer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/178bdcbd-ac5e-4bcc-ad7d-47fc6b3926e2/kisefuboriduzogisotobiko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc1d809e-b27a-4869-9fd7-bc025dd6a2c6/pesabuwam.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/pengendalian_nyamuk_anopheles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c92b4c3c-86ca-4f39-bee0-d0c174069782/watch_anchorman_online.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD588 21784 bytes
SHA-256: a1efed5672cf3899544e3f00ec8e7280b5b94875a376376fd62883469f305009
font_01_sfnt_off00011a1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1E 4972 bytes
SHA-256: d67d8c90b2fa55124e449efb436316b4848eb06d93716f576e74fcda27e26f3b
font_02_sfnt_off00012b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B28 10172 bytes
SHA-256: c63095ac548b61bf6259f47e931764f31baa31f77921d1e86bc713666ae23f65
font_03_sfnt_off00014e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E30 16688 bytes
SHA-256: 963fe4aa71575b79b37ab5d13ba08c44247e6bf5eca52609e3a3659e09fb57a0