Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dcc7d786547f314…

MALICIOUS

PDF

95.6 KB Created: 2021-02-08 02:00:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 50182238bdfbfc93436500d1c783ba36 SHA-1: e84b985f2513012b9b6cff2f3d6cc02b1ec55f67 SHA-256: 6dcc7d786547f314afc73fa4f5d1943335fe7f727f4352fdfc8fcf3789c581aa
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains and Weebly hosting, suggesting a link farm or SEO manipulation tactic. The presence of embedded URLs and the overall structure strongly suggest this document is part of a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

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://jacksth.ru/123?utm_term=subject+pronouns+in+spanish+translation PDF link annotation
    • https://varusimutajol.weebly.com/uploads/1/3/4/5/134502614/74cadf8532d8ee3.pdfIn PDF document text
    • https://cdn.sqhk.co/betewulo/iihgc0V/vemujekagexiduroxozawidu.pdfIn PDF document text
    • https://cdn.sqhk.co/bidogefapo/igjieIl/first_strike_bracket_na.pdfIn PDF document text
    • https://cdn.sqhk.co/talexadu/jgii2hj/boxezuj.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/pzhaVnA/mijawigezazefipizapufi.pdfIn PDF document text
    • https://cdn.sqhk.co/vigesiji/e8YhfaS/29139546841.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463538/normal_600167a59a1cc.pdfIn PDF document text
    • https://sepetumeba.weebly.com/uploads/1/3/4/6/134601334/1838253.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403959/normal_5ff2af68175b1.pdfIn PDF document text
    • https://xumebarukez.weebly.com/uploads/1/3/4/6/134687090/tejiwolofuv_nefogot.pdfIn PDF document text
    • https://cdn.sqhk.co/zazerejaxu/ihfgfs1/25_amazon_gutschein_code_free.pdfIn PDF document text
    • https://sojekaga.weebly.com/uploads/1/3/1/0/131070529/rejepujoluj_wavitomipu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381081/normal_601eb45e65a4b.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/wovitiku/bengali_song_basanta_ese_geche.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_off00012ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBD 5340 bytes
SHA-256: 87e1e9253d8196fc588bbed4264606afd1d205220a02ab381102ab11a0638bed
font_01_sfnt_off000140e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E0 15860 bytes
SHA-256: c0fe9d9c33645a020220d32c78260b8d2a23b6cf7c717e8bbdae44a8050498e6

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