Malicious PDF — malware analysis report

Static analysis result for SHA-256 b567c0874affb0cd…

MALICIOUS

PDF

72.3 KB Created: 2021-02-08 17:42:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 40e1359a337f96c3e48fcc45f8e50125 SHA-1: 9bfe967ade7b884ea02e7237bd8816ad7b9b2122 SHA-256: b567c0874affb0cd67a2aab079e5098849cd91f9f4524905397360ec1380faa5
186 Risk Score

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 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/aws?utm_term=analytic+geometry+worksheets+pdf PDF link annotation
    • https://sibafuguwo.weebly.com/uploads/1/3/4/6/134679660/3dc1cf66.pdfIn PDF document text
    • https://dolepaxutafajur.weebly.com/uploads/1/3/0/9/130969408/bawikakudarobijopijo.pdfIn PDF document text
    • http://xplaintome.ru/3467501409mgt1e.pdfIn PDF document text
    • https://nitevafatuva.weebly.com/uploads/1/3/4/8/134872456/c788fdaa3.pdfIn PDF document text
    • https://rijojuno.weebly.com/uploads/1/3/5/3/135310883/a1fbc1eda49e.pdfIn PDF document text
    • https://notefusiwedamap.weebly.com/uploads/1/3/4/8/134872173/kojugiripofuvuri.pdfIn PDF document text
    • https://tosoremekik.weebly.com/uploads/1/3/4/7/134771766/fanabegiku.pdfIn PDF document text
    • https://jelaxatibepa.weebly.com/uploads/1/3/2/6/132681396/tajusakuj_fovigumosomimeg.pdfIn PDF document text
    • https://gagezomelebagam.weebly.com/uploads/1/3/1/6/131606069/aa47d3.pdfIn PDF document text
    • https://selilanabos.weebly.com/uploads/1/3/4/8/134875664/1b364418f629bed.pdfIn PDF document text
    • https://jitolabifu.weebly.com/uploads/1/3/1/6/131607188/potujezuwufe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fiwarirekagugen.epizy.com/37530711752.pdfIn PDF document text
    • http://nasutewu.epizy.com/cheddars_nutrition_guide.pdfIn PDF document text
    • http://wipitawakewemex.rf.gd/little_alchemy_2_guide_cheats.pdfIn PDF document text
    • http://teboseru.rf.gd/xutesusifuvuvubijixotu.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/torch_browser_browser.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/horse_pens_40_bouldering_guidebook.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_off0000d7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D2 5816 bytes
SHA-256: 104944fef9c284048cbba13d074178b10e888318a1608ae67468cb34fae018a3
font_01_sfnt_off0000eb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB94 11444 bytes
SHA-256: 5e25d0735dc0d810cb85ac405fa82cff99e8db579329eef45475ab9d9a6de5bc

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