Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb8c2bb80daad61…

MALICIOUS

PDF

109.0 KB Created: 2021-03-18 16:25:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 02cdb910cca3ebf3d7242808ad2871e8 SHA-1: 4033534ad1f8fcd66a3e7bbb58e81fc9e739b3ee SHA-256: fbb8c2bb80daad61f5b60b68d420dad0e7c69eba80baff373621b703e793afbf
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, with the primary URL suggesting educational content to entice clicks. ClamAV and ML classifiers strongly indicate maliciousness, consistent with phishing or SEO abuse tactics. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious or suspicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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/award?keyword=prepositions+of+place+exercises+upper+intermediate+pdf PDF link annotation
    • https://losarofimet.weebly.com/uploads/1/3/1/3/131384333/2067076.pdfIn PDF document text
    • https://gosabotef.weebly.com/uploads/1/3/4/3/134332229/7679860.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422147/normal_602e52108d704.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366366/normal_604b67fa67b7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465559/normal_6045f917b0d5e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377120/normal_6006109fde4ae.pdfIn PDF document text
    • http://all-casino.xyz/lego_advent_calendar_instructions_41353itw16.pdfIn PDF document text
    • https://pufedoxavode.weebly.com/uploads/1/3/4/6/134613169/tatujim_gagojojepe.pdfIn PDF document text
    • http://swiss-gear-top.xyz/how_to_bridge_a_routerqo9hj.pdfIn PDF document text
    • https://wixetaduzem.weebly.com/uploads/1/3/4/4/134471786/bewaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366993/normal_6050147074e8a.pdfIn PDF document text
    • http://nibakelenixezas.getenjoyment.net/62127788693.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404503/normal_604e475b8d023.pdfIn PDF document text
    • http://leseweremizew.scienceontheweb.net/libro_significado_oculto_de_los_sueos_samael_aun_weor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392667/normal_5fcd612658863.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463785/normal_5fe3d6b307b6d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491173/normal_5fed164ce488b.pdfIn PDF document text
    • http://befotuke.mywebcommunity.org/mahabharata_full_story_in_english_free_download.pdfIn PDF document text
    • http://biomanix.best/article_of_association_notesnw59n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481673/normal_5fc6ac985319c.pdfIn PDF document text
    • https://sagedawigaput.weebly.com/uploads/1/3/4/3/134336778/fbbd05fb833.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dakafatuvuguviz.atwebpages.com/91614185498.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b678d7f-a5b6-4952-92aa-b9b69dce7d35/fallout_4_dlc_sized_mods_ps4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbe5b94d-cfd0-4bc2-b5dd-ceb531dbfaa4/52094562509.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_off000169a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169A2 5372 bytes
SHA-256: 0fe4cc301852f8c2cff474208f8f70cd0677075d9f1df71a7692bcb8ffc5b36f
font_01_sfnt_off00017bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BD2 12392 bytes
SHA-256: 88db2238503b5c5bb9598514af95bea96d3567974967f2cf3127fdd6fe8a599c