Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cb117346f54c272…

MALICIOUS

PDF

125.4 KB Created: 2021-03-12 18:13:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a8c92177cd444939ce2dc5965d81e9a0 SHA-1: 5cccdd5ad5b274e04389c4384e2cf1e595d1d384 SHA-256: 9cb117346f54c272781c67110a3d0df276e8d79285f575ac462f6d0b7076d870
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 0.9996

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://ponafet.ru/award?keyword=livro+receitas+dieta+cetogenica+pdf PDF link annotation
    • https://cdn.sqhk.co/weteroliwo/ahfBjcn/download_game_dig_master_mod_apk_android_1.pdfIn PDF document text
    • https://tasitonedilegu.weebly.com/uploads/1/3/5/3/135301248/nivanuk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490364/normal_5fce86c49a654.pdfIn PDF document text
    • https://cdn.sqhk.co/kalusoxat/HhdgdKD/97369941200.pdfIn PDF document text
    • https://cdn.sqhk.co/zifeduwa/jiThcic/91921577437.pdfIn PDF document text
    • https://nesipemuwazona.weebly.com/uploads/1/3/4/8/134881126/3400bead4.pdfIn PDF document text
    • https://forunevelaviwa.weebly.com/uploads/1/3/4/3/134392474/8a7c437b2360.pdfIn PDF document text
    • https://ripapexogona.weebly.com/uploads/1/3/0/8/130874469/2b643afddfdbcf.pdfIn PDF document text
    • http://zudepogumo.medianewsonline.com/gowixigebiwavunaxumimexo.pdfIn PDF document text
    • https://bisodipodur.weebly.com/uploads/1/3/4/5/134592442/xoxexikagigoxozobi.pdfIn PDF document text
    • https://mojakoxo.weebly.com/uploads/1/3/0/7/130739052/sixiburixagonukose.pdfIn PDF document text
    • http://kunujunekedi.mygamesonline.org/magic_chef_dishwasher_models.pdfIn PDF document text
    • http://kexolifowuj.medianewsonline.com/69408618799.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404133/normal_5ff4d83c66eac.pdfIn PDF document text
    • https://cdn.sqhk.co/xovinexesun/Bggihhg/xusegaxoto.pdfIn PDF document text
    • http://dunodipike.sportsontheweb.net/75861858172.pdfIn PDF document text
    • https://repawuwo.weebly.com/uploads/1/3/5/3/135313919/zijuzusatajijul-mowusijij.pdfIn PDF document text
    • https://votivugaxowo.weebly.com/uploads/1/3/1/1/131163932/xuvovosebi.pdfIn PDF document text
    • http://saxobupazes.sportsontheweb.net/how_to_fix_proform_elliptical.pdfIn PDF document text
    • https://jegiwagoxupida.weebly.com/uploads/1/3/1/3/131379361/vatiniru.pdfIn PDF document text
    • http://rosipale.scienceontheweb.net/dell_latitude_7480_manual.pdfIn PDF document text
    • https://fuwudasex.weebly.com/uploads/1/3/1/0/131071129/2221947.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://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_off00019e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E9B 5080 bytes
SHA-256: 3a13b4467ab600727a2c473c7f4c03a623737a6de647df183fcdecdafcea6414
font_01_sfnt_off0001aff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AFF3 13224 bytes
SHA-256: 6ea852a58b0d715d709c907d8af3904b026eac74d24f597b1c8d81c796613a0a
font_02_sfnt_off0001d7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D7CE 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176