Malicious PDF — malware analysis report

Static analysis result for SHA-256 14340b2826af2912…

MALICIOUS

PDF

81.3 KB Created: 2021-05-01 04:18:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 109202b4f71084c7f4585892bf61f672 SHA-1: 5f9c64ac4605410db6581fb7f8dd5ce073bfad9a SHA-256: 14340b2826af2912beb81fa213845076fb86c0d08b2ae6a57491a274c37fb6ed
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a site that appears to be a link farm designed to redirect users. The document body, though heavily obfuscated, contains text related to citizenship exams, suggesting a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/strik?utm_term=cuales+son+las+100+preguntas+para+el+examen+de+ciudadania PDF link annotation
    • https://dubibezu.weebly.com/uploads/1/3/1/4/131453247/8411773.pdfIn PDF document text
    • https://bulewafaki.weebly.com/uploads/1/3/4/6/134682315/4843a9c5c15be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485435/normal_600731367189f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366325/normal_606e9978525ee.pdfIn PDF document text
    • https://jodowofimen.weebly.com/uploads/1/3/5/3/135330599/gukekeleragetutule.pdfIn PDF document text
    • https://boxoxezerutevok.weebly.com/uploads/1/3/4/3/134317212/aea86db6.pdfIn PDF document text
    • https://cdn.sqhk.co/ronofumito/jb4rhiI/44112744486.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387567/normal_600801796dc79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369183/normal_5fdc39a3eb77d.pdfIn PDF document text
    • https://cdn.sqhk.co/rilixuzewiv/Xift8l0/byzantine_empire_history_youtube.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466173/normal_6059cfb533442.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://petovajudavo.rf.gd/2020_toyota_camry_maintenance_schedule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e843b36b-1fe4-4820-9276-ea5fcd8535c9/woxupifalimi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99b89ada-5b24-48f4-9dfa-379698a72fc2/how_many_calories_in_taco_bell_chicken_power_bowl.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/35588625262.pdfIn PDF document text
    • http://boberuxu.rf.gd/mamorazixegel.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/bayam_duri.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/pogemofanimutajoritolapig.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/denton_tx_police_accident_reports.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64fbb610-b2c6-4e8d-93db-8cc70c64a01f/dules.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ae6809b-cf50-4378-ad95-7b7187718838/17429072562.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_off0000fcdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDC 5560 bytes
SHA-256: 19a91fd7fd23297e3398484514df629822f84a036823188b3f068a5577a149e2
font_01_sfnt_off00010faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAF 12192 bytes
SHA-256: 962d6420b5d9d2a4ddd7c1ee22369fb2d42a2efaf2821a8ce5f45b05215e6341

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