Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cdbc9e23ae12716…

MALICIOUS

PDF

103.8 KB Created: 2021-02-13 09:39:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 42ab89114bcc1b24abe65e89e2937862 SHA-1: e3781c45d9aa8f13946f1aa3842cda8613e4c9b2 SHA-256: 3cdbc9e23ae127166050f24b81d0839777fa003a0614a61caba71139cd03df13
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs pointing to suspicious domains, and heuristic analysis indicates it's a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/wix?keyword=age+of+parental+consent+louisiana PDF link annotation
    • http://lasns.fun/vefoxusudu66m7w.pdfIn PDF document text
    • http://apparentlyopt.com/california_academic_performance_index_apihqnh2.pdfIn PDF document text
    • http://yourbigdick.space/leg_rope_length_guideagl4g.pdfIn PDF document text
    • http://geniusenglish.space/youtube_sky_squad_slime7kmqj.pdfIn PDF document text
    • http://belkwigs.com/mugejalmxp8.pdfIn PDF document text
    • http://ttop-shop.com/powopanasurusuvonazppabg.pdfIn PDF document text
    • http://viewcreditscore.info/tubenudm142.pdfIn PDF document text
    • https://cdn.sqhk.co/bexoninodag/6ujjehc/hutch_online_recharge_sri_lanka.pdfIn PDF document text
    • https://cdn.sqhk.co/retesixabe/ieji1jf/54010176467.pdfIn PDF document text
    • https://cdn.sqhk.co/zejizoguzut/ehfjjj0/jump_on_it_lyrics_sir_mix_a_lot.pdfIn PDF document text
    • http://smartcreditus.info/65833906655n7bn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469378/normal_5fefc13ddbe4c.pdfIn PDF document text
    • https://cdn.sqhk.co/zebenane/T14jajb/vixub.pdfIn PDF document text
    • http://gatorama.fun/reading_comprehension_online_test_with_answersogjyu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/badnam_bengali_movie_video_songs_free.pdfIn PDF document text
    • http://talifox.rf.gd/pdf_audio_reader_software.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_off00015967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15967 5172 bytes
SHA-256: 968beabecb5929c758a55f121ef07b3a41c0e62a28d0e91d452678c932d19701
font_01_sfnt_off00016b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B1C 11396 bytes
SHA-256: fe26c04e799805a1c6331b2f183c00c32e6d6c38ee26d7bee016b6a41b98d30e

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