Malicious PDF — malware analysis report

Static analysis result for SHA-256 c303a95efe9727be…

MALICIOUS

PDF

79.6 KB Created: 2021-02-14 20:14:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1d98011721d99063e24eff14bb99ba5d SHA-1: 987ad9b2cb0ac01c2c4d9770c75e6d1d73468313 SHA-256: c303a95efe9727be115bd791896b0b0db2b6080ad646ccd23d10aa1738a1d655
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the 'PDF_SEO_LINK_FARM' heuristic, suggesting it's designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the link farm and the presence of external URIs point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

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/123?utm_term=ark+dragon+boss+strategy PDF link annotation
    • https://cdn.sqhk.co/kitujesijak/MMUfjco/small_business_plan_sample_ppt.pdfIn PDF document text
    • https://gimituwemowi.weebly.com/uploads/1/3/4/8/134872285/pefizuwaxajatep-femetumagam.pdfIn PDF document text
    • https://cdn.sqhk.co/movozuba/igWiafa/download_my_ghost_girlfriend_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/xbd5Dhf/27005396791.pdfIn PDF document text
    • https://vefonero.weebly.com/uploads/1/3/1/0/131070196/2f88644c9bb3.pdfIn PDF document text
    • https://cdn.sqhk.co/jobiwokojo/9JKgjia/rogomomizivemeguwamap.pdfIn PDF document text
    • https://buritozube.weebly.com/uploads/1/3/0/7/130775753/900243.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402488/normal_6009a19ab9b55.pdfIn PDF document text
    • https://cdn.sqhk.co/limizolaxa/hifjh06/78540849798.pdfIn PDF document text
    • https://cdn.sqhk.co/lazujanaziri/ifhh2U7/ruximezelomewodigesaselu.pdfIn PDF document text
    • https://fapopadiwa.weebly.com/uploads/1/3/1/4/131438416/2514495.pdfIn PDF document text
    • https://bonujuvab.weebly.com/uploads/1/3/2/7/132740321/mebuf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402294/normal_5fde870a0c567.pdfIn PDF document text
    • https://zapineri.weebly.com/uploads/1/3/4/7/134707132/pebepepafipewaje.pdfIn PDF document text
    • https://gufekibeliwu.weebly.com/uploads/1/3/1/3/131382841/lakoruv.pdfIn PDF document text
    • https://basopuseg.weebly.com/uploads/1/3/4/7/134703880/706714.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gedokimisizat.rf.gd/wurujupokixututetes.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF7 4996 bytes
SHA-256: 054c747b684a14264504c3b6dfcc405f01d1ea368b494342fa074f14667edf0d
font_01_sfnt_off0000fd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD00 11052 bytes
SHA-256: 6cc2f3bfdac7242258be266f0badd3ed6e9c7318fb0198e00bfa8f91e3b6d16e
font_02_sfnt_off000122c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C8 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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