Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1ad5ad46ed6d06f…

MALICIOUS

PDF

73.7 KB Created: 2021-02-05 05:41:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: a52a4a3b307c7af19b11b239937ef837 SHA-1: f276d068cacfd8692f3e70552a2325319d45d4a5 SHA-256: a1ad5ad46ed6d06f821e5d47470ddfbc1198345dc277b5615544145463ab62e9
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a common tactic for SEO spam or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially malicious sites.

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://jottigo.ru/aws?utm_term=bichoo+movie+hd+video+song PDF link annotation
    • http://seedcraft.online/kozolegottotj.pdfIn PDF document text
    • https://gimepokik.weebly.com/uploads/1/3/1/6/131636980/wivipakofabiwevojuxo.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/0Mhdjg3/heron_island_wind_direction.pdfIn PDF document text
    • https://rapelolizoxofi.weebly.com/uploads/1/3/1/3/131381924/6202353.pdfIn PDF document text
    • https://rajilogibakew.weebly.com/uploads/1/3/5/3/135326989/7624157.pdfIn PDF document text
    • https://dokakuzod.weebly.com/uploads/1/3/4/8/134884054/lataju.pdfIn PDF document text
    • http://converstarget.ru/simon_blume_mathematics_for_economisnj5rf.pdfIn PDF document text
    • https://cdn.sqhk.co/rapawaferew/vjijajd/neo_lms_integration.pdfIn PDF document text
    • http://lami-lashes.site/man_down_lyrics_lil_durk0d8at.pdfIn PDF document text
    • http://clobuss.ru/1170a_504a_prison_escapeib7cs.pdfIn PDF document text
    • https://kipopidetudi.weebly.com/uploads/1/3/1/4/131407440/bbd21ab9a5.pdfIn PDF document text
    • https://xirovule.weebly.com/uploads/1/3/4/7/134749068/pisim-vetilow-ronabofodanu-lojizova.pdfIn PDF document text
    • https://buwuxebukiz.weebly.com/uploads/1/3/1/6/131606134/futenolov.pdfIn PDF document text
    • https://cdn.sqhk.co/jewimebobi/gfMhchh/xumuvatomido.pdfIn PDF document text
    • http://tadunikij.22web.org/global_history_justinian_code_worksheet.pdfIn PDF document text
    • https://bevotiwi.weebly.com/uploads/1/3/1/4/131437753/1859205.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://vinetewexe.epizy.com/aprendizaje_segun_autores.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66F 4832 bytes
SHA-256: ab90d19d789789b092956e2ce73c5629dc800ea0e01d9fb135b732c546ae19c0
font_01_sfnt_off0000e6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AF 10632 bytes
SHA-256: 068e37019a2f0bf83fb1a22d6443a641419c8156e81e2ccf86b769d99f3361cf
font_02_sfnt_off00010b0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0C 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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