Malicious PDF — malware analysis report

Static analysis result for SHA-256 a675b8f210afa73c…

MALICIOUS

PDF

110.9 KB Created: 2021-02-28 10:47:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61d80be5a0d1632ebaffd2ab4aee1f0b SHA-1: 76271dfa6b6afc7b2d07574c6afb810a3d582a43 SHA-256: a675b8f210afa73c651985f0df478b960622d172abce44f383da3526a2016e0c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, which is a common technique for distributing malicious content or conducting phishing attacks. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/wix?keyword=module+16+study+guide+physical+science
    • https://cdn.sqhk.co/fagiseregu/SYlGGgj/catfish_picture_meme.pdf
    • https://cdn.sqhk.co/jotepomi/fhjshfn/1970_mustang_428_super_cobra_jet_engine.pdf
    • https://cdn.sqhk.co/xidatelo/z4gdVvv/word_legend_puzzle_addictive_crossword_connect.pdf
    • https://cdn.sqhk.co/tosobulig/gbQR1LD/87823833600.pdf
    • http://fasekafalig.scienceontheweb.net/moon_river_sheet_music_free.pdf
    • https://jafobepajimo.weebly.com/uploads/1/3/4/8/134881918/5644965.pdf
    • https://raxiruzaxulam.weebly.com/uploads/1/3/0/7/130738564/23c4fd9ac.pdf
    • https://jijobowuzum.weebly.com/uploads/1/3/4/5/134590228/6363396.pdf
    • https://ronogutelujevur.weebly.com/uploads/1/3/5/9/135956648/f6d11a7ebf.pdf
    • http://mexirumix.iblogger.org/consulting_agreement_template_word.pdf
    • https://cdn.sqhk.co/bafujifi/enif2ka/westy_west_cowboys_mod.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tezude/mr_coffee_iced_coffee_machine_with_tumbler.pdf
    • http://xomapagovujux.atwebpages.com/rabonifetelojudukuwufovif.pdf
    • https://s3.amazonaws.com/fejakixoweka/60550509837.pdf
    • https://s3.amazonaws.com/lijopavexanuse/18664106871.pdf
    • https://s3.amazonaws.com/gazivemon/juwovixiwujowetuxegag.pdf
    • http://donosusiligid.rf.gd/pimuzizixotujok.pdf
    • http://tavoxelelenasi.onlinewebshop.net/abraham_hicks_the_amazing_power_of_deliberate_intent.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000176c1.bin
798a4a6650de2477f67645438dcebc154ce5e7bc46f19ea14836d1c9ffc478a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x176C1 5552 bytes
font_01_sfnt_off000189b8.bin
1f1f92a934338d445af474e2a62b17334265cc27db9324fea134b4ee00554ea7
pdf-font-stream PDF embedded font (sfnt) at offset 0x189B8 10684 bytes