Malicious PDF — malware analysis report

Static analysis result for SHA-256 552c221019e69eb5…

MALICIOUS

PDF

76.9 KB Created: 2021-02-25 05:39:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d854da013365440c370b0f1775bd551a SHA-1: 1b079cd0b40c3806fc48a12a9cb9dcbd1e86d972 SHA-256: 552c221019e69eb51c61846b8f643c7d85499981011c925814f042431fdec2ab
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-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://bologen.ru/123?utm_term=how+long+does+it+take+to+study+for+the+fundamentals+of+engineering+exam PDF link annotation
    • https://tumumasozoborux.weebly.com/uploads/1/3/1/4/131453535/b595d78ed660.pdfIn PDF document text
    • http://indohealth365.online/kepataxigepiwivozoi1v43.pdfIn PDF document text
    • https://cdn.sqhk.co/konidadelan/Wifjjgi/domain_history_checker_tool.pdfIn PDF document text
    • https://jalesebexiw.weebly.com/uploads/1/3/0/7/130739560/dojenixek.pdfIn PDF document text
    • http://akillidestekbasvuruformu.online/graphing_sine_and_cosine_functions_worksheetgo6jf.pdfIn PDF document text
    • http://wide-mean.top/wezutatokiwok93ue.pdfIn PDF document text
    • https://lupudeme.weebly.com/uploads/1/3/1/3/131378919/luxafanulomewu_vixog.pdfIn PDF document text
    • https://cdn.sqhk.co/zupivikeg/dhd2che/kanobufexixenav.pdfIn PDF document text
    • https://cdn.sqhk.co/jemitaso/hJiigWd/kung_fu_panda_toys_online.pdfIn PDF document text
    • http://3-bureaureport.info/conditional_in_reported_speech_grammarv0fvw.pdfIn PDF document text
    • https://vilifamizebu.weebly.com/uploads/1/3/4/6/134617150/farufasax.pdfIn PDF document text
    • https://vafopizinenited.weebly.com/uploads/1/3/4/4/134480139/mojobisexevalil_wuwam_kifedomutodudu_fotobaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://goregined.rf.gd/12506175015.pdfIn PDF document text
    • http://siripuxem.rf.gd/39110819277.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_off0000ef67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF67 5608 bytes
SHA-256: bb6270986a0b2736950c5945898cc634f38ed8fed5ce0c70e9adce336caddab0
font_01_sfnt_off0001026f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026F 10520 bytes
SHA-256: 8c1411164f8437539fe0e80e3fba17297fa28dba0578ca57140c3435e6d5a519