Malicious PDF — malware analysis report

Static analysis result for SHA-256 853dafdb56c1bf37…

MALICIOUS

PDF

67.6 KB Created: 2021-02-27 11:46:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 297e596fff4a7b467ad2496c60bd4d1d SHA-1: e3aeccaa0e553d1c8a06d448143b237cdc308c02 SHA-256: 853dafdb56c1bf3756cbc3a7356aacb771874227482f1affa408984893379175
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. The PDF contains numerous embedded URLs, many pointing to disposable hosting services, consistent with a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to deliver a second-stage payload or phish for credentials.

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://mezovuduw.ru/strik?utm_term=asana+pranayama+mudra+bandha+pelo+swami+satyananda+saraswati PDF link annotation
    • https://zogopovedizojux.weebly.com/uploads/1/3/1/4/131408172/ad499674e26b637.pdfIn PDF document text
    • https://cdn.sqhk.co/sujubowip/CGiiiZ0/50911162874.pdfIn PDF document text
    • https://tupodawemizaz.weebly.com/uploads/1/3/4/5/134594588/845127d.pdfIn PDF document text
    • https://cdn.sqhk.co/kekagate/Bhd2wT8/k12_jobs_online.pdfIn PDF document text
    • http://help-verification.com/what_to_eat_for_breakfast_elimination_dietatqff.pdfIn PDF document text
    • https://dodilepu.weebly.com/uploads/1/3/4/4/134444379/gunem-pifufab.pdfIn PDF document text
    • http://deutschebank-meine.com/73266272560qkjn9.pdfIn PDF document text
    • https://zagozejidenadap.weebly.com/uploads/1/3/1/4/131407028/wumagul-retik.pdfIn PDF document text
    • https://diritirafimiwav.weebly.com/uploads/1/3/4/3/134376035/04b891.pdfIn PDF document text
    • http://belldiscount.ru/approach_to_bleeding_disorders_in_child1fbz8.pdfIn PDF document text
    • http://cardioactiveuficiale.site/6567487888se7bp.pdfIn PDF document text
    • http://busurman.space/54770183788a785y.pdfIn PDF document text
    • http://korecos.ru/how_to_find_net_working_capital_from_balance_sheetnpqit.pdfIn PDF document text
    • http://handler-autoscout24.com/308034550365pa7b.pdfIn PDF document text
    • https://cdn.sqhk.co/loxexafetivu/ahcuhdS/memes_stickers_pack.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/jujadodedaruxix/pradhan_mantri_awas_yojana_registration_form.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/grand_chase_zero_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/aadhar_card_password.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_off0000c854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC854 5520 bytes
SHA-256: 9b089fa8b9dd5caa872b9f1b6b024bdc68b0470d338ff5981bce1b5fc9d27138
font_01_sfnt_off0000daff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFF 11480 bytes
SHA-256: 1c290bb75a1e1fcaadb8f22c08419da211cfcbcc1e2c4ab3f6069476f36bea61

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