Malicious PDF — malware analysis report

Static analysis result for SHA-256 0416538ef8481437…

MALICIOUS

PDF

69.0 KB Created: 2021-01-24 21:09:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 01be885ade210c05c63f364eeb1cf081 SHA-1: 8c760346a1894b40f467aa51582dce13d40d7a78 SHA-256: 0416538ef8481437ade535f436086b1bf140453b6b13ddf667ca9e22ddf95f33
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a phishing or redirection attack, likely initiated via spearphishing.

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://druttle.ru/wb?keyword=american%20civil%20war%20timeline%20map PDF link annotation
    • https://wuzakadebetes.weebly.com/uploads/1/3/0/8/130814976/javusu.pdfIn PDF document text
    • https://jobalexaxikut.weebly.com/uploads/1/3/4/8/134892204/pufoposakoturu.pdfIn PDF document text
    • https://lagisarer.weebly.com/uploads/1/3/4/1/134131240/kotatirunun.pdfIn PDF document text
    • https://liberiloro.weebly.com/uploads/1/3/4/5/134589576/7d8e8f7269.pdfIn PDF document text
    • https://vinawulisakuj.weebly.com/uploads/1/3/2/7/132712505/6123063.pdfIn PDF document text
    • https://vexibalob.weebly.com/uploads/1/3/4/8/134896466/99a823a58.pdfIn PDF document text
    • https://cdn.sqhk.co/xisiwuba/EKjeyia/let_s_create_pottery_best_design.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sozogakuvigoxev.epizy.com/android_tablet_reviews_2018_uk.pdfIn PDF document text
    • http://binawojojin.epizy.com/bengali_parikhit_bala_baul_song.pdfIn PDF document text
    • http://magivaxinel.rf.gd/49748479563.pdfIn PDF document text
    • http://rigitusavogu.epizy.com/logic_of_english_spelling_rules.pdfIn PDF document text
    • http://rituruve.epizy.com/ultrasound_guided_cannulation_tips.pdfIn PDF document text
    • http://mebexadesojixip.rf.gd/68954295018.pdfIn PDF document text
    • http://lopamosetumug.epizy.com/botefizag.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_off0000d0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B1 5044 bytes
SHA-256: 10897cd619688ba7e9cf0b469605aef518f5e156d89eb670ea6a0e84da7ada39
font_01_sfnt_off0000e1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D6 11112 bytes
SHA-256: f5f0ce1374899576a6b4e3802fe339113e155940e32a19a41359538b80fd0578

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