Malicious PDF — malware analysis report

Static analysis result for SHA-256 4de4909619d36573…

MALICIOUS

PDF

61.0 KB Created: 2021-02-10 03:39:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 63d762713e67adeb8be7274e5ec6f545 SHA-1: 7f04289170b842f2861de909fbeb0c5db55334ef SHA-256: 4de4909619d3657382792fd9696f3e43ea39d63522cd5093836f1bc33275218c
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://druttle.ru/wb?keyword=audio%20facebook%20love%20by%20essence PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4414498/normal_60027e1f0d04c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426550/normal_5fe4aa4e0dfb9.pdfIn PDF document text
    • https://dolilugufup.weebly.com/uploads/1/3/0/7/130776220/jegefatufakani.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482426/normal_5fd229d677b4a.pdfIn PDF document text
    • https://kofagegupuk.weebly.com/uploads/1/3/2/3/132302723/eb3f2ec640113d.pdfIn PDF document text
    • https://cdn.sqhk.co/leporolino/Pjcjilf/59823591180.pdfIn PDF document text
    • https://rifituxajigibik.weebly.com/uploads/1/3/4/5/134519767/8586080.pdfIn PDF document text
    • https://cdn.sqhk.co/turomixo/80ligij/fukugor.pdfIn PDF document text
    • https://degevibuv.weebly.com/uploads/1/3/5/3/135316410/kuxilekesadoxosifuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vedezaduxi.epizy.com/geroditapenet.pdfIn PDF document text
    • http://suvemavukefejig.epizy.com/10600165762.pdfIn PDF document text
    • http://miwefonozez.epizy.com/sosikoxan.pdfIn PDF document text
    • http://jipudovisubu.rf.gd/sri_ranganathaswamy_songs_free.pdfIn PDF document text
    • http://vidokewokesun.rf.gd/55303373106.pdfIn PDF document text
    • http://gubodasitonobu.epizy.com/report_of_the_adaptation_fund_board.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_off0000b12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB12B 5276 bytes
SHA-256: e65c5a3b8a77a1679fbc6a98fb88b5a2edeb6b90f4b6404958d9dc378bbd207a
font_01_sfnt_off0000c344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC344 10512 bytes
SHA-256: 30090460287959d25b380b9d397aca0bb12ded3b3952865bd7ec6ec5176bdc57

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