Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6b072769846e366…

MALICIOUS

PDF

72.0 KB Created: 2021-02-27 03:53:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 42ab18b4c864b256a9642039a14a228f SHA-1: c3c249cdcd9dab2f0854d285343c07c77ea0bd28 SHA-256: b6b072769846e366f3d799c9b6f7326a461602d9cd8869881368083dc3999647
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. ClamAV and ML classifiers identify this as a phishing or malicious PDF. The embedded URLs suggest an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/award?keyword=learn+hindi+books+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/loxowopiv/f8xgjtq/othello_summary_act_3.pdfIn PDF document text
    • https://cdn.sqhk.co/zofizitene/ic91ieU/7688158092.pdfIn PDF document text
    • https://malosana.weebly.com/uploads/1/3/5/3/135323031/6561548.pdfIn PDF document text
    • http://dixurujisefumet.22web.org/11792417337.pdfIn PDF document text
    • http://verifiedbadge-lnstagram.com/xosuniferomakunieiwfj.pdfIn PDF document text
    • https://ragaxunuwad.weebly.com/uploads/1/3/1/4/131407405/siwomikajogarom-bokekine.pdfIn PDF document text
    • https://cdn.sqhk.co/gasajolop/exihQyw/lelugovir.pdfIn PDF document text
    • https://cdn.sqhk.co/someteku/jaggjbM/lidifeles.pdfIn PDF document text
    • http://mjawebdesign.net/72066353560o24h1.pdfIn PDF document text
    • https://vekewofamir.weebly.com/uploads/1/3/4/1/134131384/ccdeb7b6cd71166.pdfIn PDF document text
    • https://cdn.sqhk.co/mizogujuzo/DCRZRhb/19306322941.pdfIn PDF document text
    • https://poginatiru.weebly.com/uploads/1/3/0/8/130874277/7028007.pdfIn PDF document text
    • https://gumotamilo.weebly.com/uploads/1/3/5/3/135319527/5637803.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bujoraz.rf.gd/forifuguwilafaf.pdfIn PDF document text
    • http://rubirabe.rf.gd/fejimowama.pdfIn PDF document text
    • http://gawekavadave.epizy.com/horizontal_recyclerview_in_android.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_off0000dd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8A 5364 bytes
SHA-256: 547189d135be33e1ee5974215e5de12e8017b123d906d2dce808850c8cfc008d
font_01_sfnt_off0000efd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD6 10376 bytes
SHA-256: d307da379f972862eea3b4eaa65cdbd139b0508d9beb38e622c5605a13716fe4

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