Malicious PDF — malware analysis report

Static analysis result for SHA-256 80e2b63e3d37a561…

MALICIOUS

PDF

70.7 KB Created: 2021-02-23 05:43:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 833d77fbf41bb856004de396b32e2124 SHA-1: 21ab001d3b0e15089446645219cff44d34135612 SHA-256: 80e2b63e3d37a5617b6fb13cd68307ad1264f6f58af482b964d71ca7cbe2a5a8
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a PDF SEO link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest an attempt to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/strik?utm_term=average+mechanical+engineering+salary+out+of+college
    • https://buzixigadojaw.weebly.com/uploads/1/3/5/3/135316262/ab8aa8fb7d2a2.pdf
    • https://zizovotitimojuv.weebly.com/uploads/1/3/2/7/132712514/kebimaruvi.pdf
    • http://voztrans.ru/baby_g_shock_manual_32481f29p.pdf
    • http://todayshop.website/wupoluvezekunomojymgx.pdf
    • https://cdn.sqhk.co/lilomovetum/ytjguhc/20520374570.pdf
    • https://zawasofolebu.weebly.com/uploads/1/3/4/9/134902788/xebiveruvuxewukumev.pdf
    • https://xozuvopirabupo.weebly.com/uploads/1/3/4/5/134599715/9142548.pdf
    • https://banafazag.weebly.com/uploads/1/3/4/3/134325205/giburofinunow.pdf
    • https://tapizijivuvol.weebly.com/uploads/1/3/2/6/132696465/d394e390556fee.pdf
    • https://fefolidagemilo.weebly.com/uploads/1/3/1/4/131453124/fupumakad_mutosojijifu_milos_fufiluvelim.pdf
    • https://cdn.sqhk.co/lexoxuxoluvi/Hhjoicx/40900381612.pdf
    • https://rapowude.weebly.com/uploads/1/3/1/4/131454581/zavav.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xeruxaxer/exponents_practice-_challenging_problems_answers.pdf
    • http://rojugukilajix.epizy.com/node_axios_file.pdf
    • https://s3.amazonaws.com/kevava/tawog.pdf
    • https://s3.amazonaws.com/mexavofezoxi/bakelite_sheet_weight_calculator.pdf
    • https://s3.amazonaws.com/jemisajoda/48251605460.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_off0000d744.bin
bc2431637ec31ae30b7722f10ea8fe34cb34632acbfb8b3ff2ca5234e650d636
pdf-font-stream PDF embedded font (sfnt) at offset 0xD744 5444 bytes
font_01_sfnt_off0000e9b5.bin
fedaba47dd98b324b81590f637c86b57630c9e6fdfb9002c8835613aed24eec4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B5 10512 bytes