Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5ba539981529097…

MALICIOUS

PDF

73.1 KB Created: 2021-04-02 19:42:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 914fca7f0d8bb3e479dcc6a9b39a682a SHA-1: 1c8347f6a091b054b36b58929777ce17a2e50322 SHA-256: a5ba5399815290972ecf68052be7745377b5826869a93a0b866de07bafb0443c
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with several pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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 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://pelibifir.ru/strik?utm_term=what+is+in+a+frozen+vanilla+chai+from+dunkin+donuts PDF link annotation
    • http://zootime.store/davevegocc3c1.pdfIn PDF document text
    • http://votofeveta.iblogger.org/beethoven_5th_symphony_ringtone.pdfIn PDF document text
    • https://pujuxapalijened.weebly.com/uploads/1/3/6/0/136009243/dazurawixik_gogezu_mukopezona_bevisuwa.pdfIn PDF document text
    • http://namelesssouth.xyz/xiruxulawufaby5e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496571/normal_5fffb8f32c429.pdfIn PDF document text
    • https://jedifubebevaze.weebly.com/uploads/1/3/4/8/134873515/xowibilo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379363/normal_5ff12280e0ede.pdfIn PDF document text
    • http://feziweninepiv.iblogger.org/jifis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407795/normal_601788bfa4abb.pdfIn PDF document text
    • https://bobilemako.weebly.com/uploads/1/3/4/7/134733435/giwakoke-zidogus-mabidefexaso-jabupexofatuta.pdfIn PDF document text
    • http://store50off.info/exagear_windows_emulator_rartz8k0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482880/normal_604d78c5295b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450428/normal_6046539014a55.pdfIn PDF document text
    • http://rezltml.xyz/juventus_fc_academy_twitter5t7g7.pdfIn PDF document text
    • http://getsol.xyz/95617118093029p4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416940/normal_601392ac6de02.pdfIn PDF document text
    • http://dmgameplan.com/95864479333uhk6v.pdfIn PDF document text
    • http://garant-ritual.online/baklol_video_part_6zt0ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476436/normal_601ee10c8afca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366336/normal_5ff50820d10be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504047/normal_605ca1d009893.pdfIn PDF document text
    • http://tetikesebes.22web.org/fascismo_eterno_eco.pdfIn PDF document text
    • https://pupizotewijuguw.weebly.com/uploads/1/3/0/7/130775862/bobugipapa-dimepesarut.pdfIn PDF document text
    • http://itwomen.space/91435583269nngta.pdfIn PDF document text
    • http://scandisvet.ru/do_timex_watches_need_batterieshn0x4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gewagopixinilu.rf.gd/bituwogetalulapuvexozo.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_off0000e12f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12F 5448 bytes
SHA-256: b8d794d6eb3b165efd02eb53b73e2208f5a5a992f24a519c33d83c038696c00e
font_01_sfnt_off0000f3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A8 10128 bytes
SHA-256: 01ca09b7b72979db3feda6756069c9d589a3f7757d1bae8fdd5857b706d07dcb

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