Malicious PDF — malware analysis report

Static analysis result for SHA-256 2902f54895d831bb…

MALICIOUS

PDF

77.6 KB Created: 2021-03-15 21:33:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9814a97e1330f738f125003bd2c5910b SHA-1: ecdf6b09844e73dd9b994c394a0b0745e039a4b1 SHA-256: 2902f54895d831bb9f7227c11dd8b3c5e2588c2970541e2ee702bf457096d48f
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs 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-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://midufefew.ru/strik?utm_term=how+to+set+my+water+softener+hardness PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4472788/normal_603fe319cd2e3.pdfIn PDF document text
    • http://xagonezunoli.iblogger.org/812484316.pdfIn PDF document text
    • http://stixlife.info/rukofupikesc49e1.pdfIn PDF document text
    • http://dazogefase.22web.org/ravokotitewuginegevivan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420432/normal_601038ef72851.pdfIn PDF document text
    • http://remont-kholodilnikov.website/54812156177tf0vn.pdfIn PDF document text
    • http://afracheat8.xyz/tuwupegfym6a.pdfIn PDF document text
    • http://dazenad.iblogger.org/dupim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_2c4f133feeec43bc896b41922653fabc.pdf?index=trueIn PDF document text
    • http://xalovizavana.rf.gd/netis_wf2419e_manual.pdfIn PDF document text
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_7e95a38644954aa1a544dca6bce69e50.pdf?index=trueIn PDF document text
    • https://48b7024d-7414-4593-b44d-ed892b96ad15.filesusr.com/ugd/3e5db3_cce38316ce5f4b02ab6dd06cafd0f2a3.pdf?index=trueIn PDF document text
    • http://pojoxonofed.rf.gd/lamoxorisuzu.pdfIn PDF document text
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_750c0b100dd74f50bae789f5012a9773.pdf?index=trueIn PDF document text
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_d33e9e637f6940b6a870ab5798dcb2d5.pdf?index=trueIn PDF document text
    • https://d1897088-ef6e-4b60-8303-910b4b551fc1.filesusr.com/ugd/4cfbbd_397431b01b714e8c8b852f6c4f8b4575.pdf?index=trueIn PDF document text
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_f9cb476c0b2b4513b2b35ae4b2d52bf3.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_off0000f1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D2 5268 bytes
SHA-256: cdb3db0c35fd4b32ae3a7b4a355bb780391b01cacd3edf656baed6a50cdc7e33
font_01_sfnt_off000103a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A1 10972 bytes
SHA-256: 0f45f2c78995a9f48f0748703fe1a0a0e556858a86f73ce76afa2e5253569400

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