Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a50570786eebc19…

MALICIOUS

PDF

76.2 KB Created: 2021-04-15 12:18:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 358565c6f66117fc1d138338f5b96a8e SHA-1: 17309f03821a8bfe9af11958975c11736bb62be6 SHA-256: 1a50570786eebc19f4fb477d0a95e4c62420b3f53b8be0d2372a42d770a6f597
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with the primary URL pointing to a suspicious domain. ClamAV also detected this file as a phishing trojan. The presence of embedded URLs and the link farm heuristic strongly suggest a phishing or spamming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://nipisod.ru/strik?utm_term=ravpower+filehub+default+admin+password PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490250/normal_60315c6d7e53e.pdfIn PDF document text
    • https://zurukonovode.weebly.com/uploads/1/3/1/3/131379219/8990947.pdfIn PDF document text
    • https://finolija.weebly.com/uploads/1/3/4/6/134625313/zopomefud.pdfIn PDF document text
    • https://binimejo.weebly.com/uploads/1/3/4/6/134665204/2147276.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410983/normal_5ff9212cbd70a.pdfIn PDF document text
    • http://xaritilufowav.22web.org/gobadovun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xazogugikuriwox.rf.gd/acid_base_and_salt_class_10_download.pdfIn PDF document text
    • https://s3.amazonaws.com/kiremefegonar/46272314681.pdfIn PDF document text
    • http://mujixexebekipan.rf.gd/neonatal_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/numunenoji/bad_blood_nao.pdfIn PDF document text
    • http://bebefavovujeji.rf.gd/clear_speech_strategies_visual.pdfIn PDF document text
    • http://pilifixatibese.epizy.com/how_many_calories_does_a_tostada_salad_from_pollo_loco_have.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/cast_from_chrome_to_android_tv.pdfIn PDF document text
    • http://xanabakawori.epizy.com/53602474558.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/the_drama_of_scripture_ebook.pdfIn PDF document text
    • http://pimokizogo.epizy.com/chapter_20_building_vocabulary_politics_of_the_roaring_twenties.pdfIn PDF document text
    • http://xegefonupekowa.epizy.com/2013_subaru_wrx_sti_limited_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/35672473375.pdfIn PDF document text
    • http://nubijusumodas.rf.gd/nobokoxenokifinu.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_off0000e883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE883 5580 bytes
SHA-256: c7d2c08e047543127cb0d7744f72ba58b5eff2e4151a09ad7d38542a352b7871
font_01_sfnt_off0000fb68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB68 11400 bytes
SHA-256: 2d05c4ac29e3a76e38946e3eb6a9d234bb3a2d92221cfbb8046bb9c2a04ece33

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