Malicious PDF — malware analysis report

Static analysis result for SHA-256 74b3dd2af3e9fb38…

MALICIOUS

PDF

83.9 KB Created: 2021-03-16 02:47:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 221bc2f4f638a1864661c95aa4a2841c SHA-1: 04b6247ca266733d93f1c2eda536f8b7fcec5c4c SHA-256: 74b3dd2af3e9fb38ccc282be4904914fbd05c684f31ecf79cee26fd5956876a5
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, which is characteristic of a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/strik?utm_term=how+to+test+limit+switch+on+furnace PDF link annotation
    • https://sodefabufu.weebly.com/uploads/1/3/4/4/134473286/tonezajiwefak.pdfIn PDF document text
    • https://levevuwakute.weebly.com/uploads/1/3/4/9/134904524/xesulaxelanutadaj.pdfIn PDF document text
    • http://kadabafomelu.66ghz.com/xigilazagifirivobonabukak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372076/normal_604d2958f3349.pdfIn PDF document text
    • https://kujegafibez.weebly.com/uploads/1/3/4/2/134265926/godidudarem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454182/normal_602e1ef14b32a.pdfIn PDF document text
    • https://tusatetop.weebly.com/uploads/1/3/1/4/131408029/2697fb845266c1e.pdfIn PDF document text
    • https://vaxulazazoju.weebly.com/uploads/1/3/4/5/134587837/durujepera-tukezoxotakoda-jazipode.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489052/normal_5fd6c462eede5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385216/normal_60446996d59fb.pdfIn PDF document text
    • https://fevuvewuvadudu.weebly.com/uploads/1/3/4/6/134650824/gamanunexom_pozugesuzamo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500450/normal_601eebef1a1d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448540/normal_60489cd20a0c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382208/normal_5ff5e93e7c14e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445868/normal_602645aed61f5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fixufesasuz.epizy.com/notify_fitness_for_mi_band_apk.pdfIn PDF document text
    • http://roxusenedo.epizy.com/13757045244.pdfIn PDF document text
    • http://poxizaxo.epizy.com/kohler_marine_generator_parts_online.pdfIn PDF document text
    • http://bejofidexi.epizy.com/amazing_pictures_of_nature_free_3d.pdfIn PDF document text
    • http://xugekevilop.rf.gd/outlander_series_paperback_books.pdfIn PDF document text
    • http://xewaditina.epizy.com/zibed.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_off00010c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9F 5172 bytes
SHA-256: b353ed776b4f748d0bbd92daa4ffd58f51f8f2e54bf33905dd96ef0646fdbbdb
font_01_sfnt_off00011e1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1C 10616 bytes
SHA-256: 2ac569f204a8d049ef7d46dca96fa922a1e19bb09721198fc3b94b59c9ed514e