Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fdc328172a0d1d5…

MALICIOUS

PDF

73.6 KB Created: 2021-02-28 00:21:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7095db72fb84d3eaa0331c8a79612451 SHA-1: 26bfa06c95890b59ea3be9c65bf10d37bd307d94 SHA-256: 1fdc328172a0d1d5558b177157846d0b383c8669ed1679ab507e5608a364c3bd
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The document body, though heavily obfuscated, appears to be a lure related to product searches, aiming to trick users into visiting these malicious sites.

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 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://baarspo.ru/aws?utm_term=what+is+the+best+pressure+cooker+to+buy+for+home+use PDF link annotation
    • http://astrology-personal.online/dusexiduzidic0k1z.pdfIn PDF document text
    • https://selimubujupaso.weebly.com/uploads/1/3/4/8/134847774/kuneruzo.pdfIn PDF document text
    • http://forexgeeks.net/baby_goats_in_pajamas_imagesy5orn.pdfIn PDF document text
    • http://mugafopame.iblogger.org/34913804287.pdfIn PDF document text
    • http://axecheat7.xyz/facebook_banner_size_template_2018bv7ei.pdfIn PDF document text
    • https://zumekaxiligub.weebly.com/uploads/1/3/5/3/135385258/nesamigagaselijal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490752/normal_603441a7547c0.pdfIn PDF document text
    • http://zesamoa.online/jixakurifuke66kg9.pdfIn PDF document text
    • http://asia.kiwi/wokukaxukavunotof1v5xd.pdfIn PDF document text
    • http://stav-games.ru/steam_use_chat_effects5gj9z.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://buzuvemujogumob.epizy.com/76720357580.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/android_custom_toolbar_shadow.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/amazon_quiz_contest_today_answer_win_50000.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_off0000e223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE223 5540 bytes
SHA-256: e8a94275e51ba4493c6329df4705ed1dba84aeb208d86ad08cbea4ce616b7f91
font_01_sfnt_off0000f4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EC 10812 bytes
SHA-256: 77821df29166a39621b90aec104a2bf428a73abecbae414093606e4e199149a5

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