Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cbc86f0552800e2…

MALICIOUS

PDF

66.0 KB Created: 2021-04-08 09:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 76547023780c5e504477b3e8341d8167 SHA-1: 18d5fdea7b1ef9c7f035cfe47ed8cedb9b2fa9a9 SHA-256: 1cbc86f0552800e244419afcdfe4cecb984e67de424e6b1bba4b2ab955075a0d
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm designed for SEO manipulation and potential phishing. It contains numerous external links, many pointing to disposable hosting, suggesting an attempt to drive traffic to malicious or deceptive websites. The embedded URLs and the document's structure indicate a phishing or scam attempt, likely using the guise of educational content to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/wix?keyword=2.1.3+free+body+diagram+answer+key PDF link annotation
    • http://tiluvopira.medianewsonline.com/research_articles_on_employee_absenteeism.pdfIn PDF document text
    • https://cdn.sqhk.co/givesaxi/bREgfhb/garovoz.pdfIn PDF document text
    • https://cdn.sqhk.co/gabebutiz/Z0hepOk/jakabetusoro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455876/normal_601a1b9f11bd0.pdfIn PDF document text
    • http://timinome.getenjoyment.net/lexus_rx_350_for_sale_2017.pdfIn PDF document text
    • https://cdn.sqhk.co/wesuwajil/kghgegj/bollywood_road_trip_movies_list.pdfIn PDF document text
    • https://cdn.sqhk.co/ragojagef/eijhfhe/fnac_shadow_candy_jumpscare.pdfIn PDF document text
    • https://cdn.sqhk.co/wagavoketi/dIZhjL3/signal_private_messenger_pro_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402486/normal_6018afbe0835a.pdfIn PDF document text
    • https://cdn.sqhk.co/vufebevefo/hagjvX8/likovekuzemokixizanekerub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379473/normal_6012fb1a2a8be.pdfIn PDF document text
    • http://fajamad.mypressonline.com/xedesubijasi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d4078116-a2d5-466f-97e6-20d899f6ca30.filesusr.com/ugd/576447_ec10c0473c5144a49ffbfe2c82c290d6.pdf?index=trueIn PDF document text
    • https://5090cb7a-f7dd-45b7-a4a3-960150b62b23.filesusr.com/ugd/dfd4af_ddaea7bac6e44cb1ab79757d7643646b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0aee0166-f69f-4e5d-9914-13d2e687f59c/cloud_atlas_cast_transformations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97a0a8ae-95bd-494c-bae1-8005c9a8af46/fomokomexitow.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_off0000c03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC03C 5880 bytes
SHA-256: 6878a4fa409625d0256134b9d0532d4514852c90dbc7705077514a14fe053a63
font_01_sfnt_off0000d452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD452 10872 bytes
SHA-256: 6641a5ad029ef23a2c6a53611bbe78f5b92f679096a3a91cfcc2cb3b29b5aae5

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