Malicious PDF — malware analysis report

Static analysis result for SHA-256 de7dc33264d33a1c…

MALICIOUS

PDF

72.8 KB Created: 2021-02-26 00:17:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 146730e76b0296ed9923bc31d51877b4 SHA-1: 1b7e1e917773f19991252a564072835dbc8b54fb SHA-256: de7dc33264d33a1c2b1c285b91f2d1d85b1f13d51b414b635d342c7d2ab6f22f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://maypoin.ru/123?utm_term=naming+chemical+formulas+worksheet+with+answers PDF link annotation
    • https://gopaposoxawa.weebly.com/uploads/1/3/0/7/130740193/9570135.pdfIn PDF document text
    • https://majosipodolonax.weebly.com/uploads/1/3/0/8/130814003/komowalorosejami.pdfIn PDF document text
    • https://cdn.sqhk.co/wusakituzu/geFfGQE/pound_cake_drake_bpm.pdfIn PDF document text
    • https://cdn.sqhk.co/bisegepamitu/7ggwl6O/rofunopofidalunobozejo.pdfIn PDF document text
    • https://miwovikefutus.weebly.com/uploads/1/3/0/9/130968988/8695582.pdfIn PDF document text
    • https://fumamefix.weebly.com/uploads/1/3/0/8/130873833/2930170.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482625/normal_60251a87b4832.pdfIn PDF document text
    • https://jifilebipik.weebly.com/uploads/1/3/4/3/134375607/nizaz-ponepomazifu-zoguvalusi.pdfIn PDF document text
    • https://cdn.sqhk.co/tifesijoja/bEUGcic/womufubewisogunef.pdfIn PDF document text
    • https://cdn.sqhk.co/menekilebuz/hgiIijM/16239664132.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367277/normal_600cfade8041d.pdfIn PDF document text
    • https://jafuxudaxifi.weebly.com/uploads/1/3/0/7/130739212/fdefb21e8b83.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://watuvul.epizy.com/scag_freedom_z_36_for_sale.pdfIn PDF document text
    • http://mirimanomuropa.rf.gd/commuters_guide_to_baguio.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_off0000df6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6F 5420 bytes
SHA-256: 060b20df4691c9a8857cedb16536a94293f626ea22efcfcb6cde01ca5042c56a
font_01_sfnt_off0000f1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D6 10588 bytes
SHA-256: a136c52cd0e5590fdc293b3a07ec58298e6dd2b3a190707275969da31b276dae

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