Malicious PDF — malware analysis report

Static analysis result for SHA-256 b31664e1f4a3512f…

MALICIOUS

PDF

77.2 KB Created: 2021-03-08 17:17:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 074feee14907953350176267eff09c53 SHA-1: 5c2a4501ed81bf1ac3eebdbe521973516dcc3168 SHA-256: b31664e1f4a3512f36279b737ce177fea36ef715253bb9d7eeab72a0534a244b
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs that point to suspicious domains, including one that appears to be a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The document body, though heavily obfuscated, suggests a lure related to 'chopsticks sheet music', directing users to external URLs.

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://jottigo.ru/wix?keyword=chopsticks+sheet+music PDF link annotation
    • http://garantiya62.ru/kodak_alaris_s2050_manual9jmw7.pdfIn PDF document text
    • https://xaforegitada.weebly.com/uploads/1/3/1/4/131413040/zafizunut-xedusosupo-gajosatomik-losadukifoti.pdfIn PDF document text
    • http://picply.ru/82617983948df01p.pdfIn PDF document text
    • http://itnegozio.info/pride_and_prejudice_chapter_13_summary_shmooprord7.pdfIn PDF document text
    • https://cdn.sqhk.co/soxemudu/TWbjikn/pixel_gun_3d_online_games.pdfIn PDF document text
    • https://cdn.sqhk.co/pefisemise/ihKCjcX/11301098727.pdfIn PDF document text
    • https://cdn.sqhk.co/gosukutusu/jhgjgij/58929299363.pdfIn PDF document text
    • https://lenexemumuvag.weebly.com/uploads/1/3/1/4/131438583/7206969.pdfIn PDF document text
    • http://todayshop.website/fifth_grade_persuasive_essay_samples771gj.pdfIn PDF document text
    • http://gakmancreatures.ru/holt_physics_chapter_4_mixed_review_answersvbuqn.pdfIn PDF document text
    • https://cdn.sqhk.co/dolafita/qhhe1mv/kaiser_permanente_jobs_tualatin_oregon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_02ba1f7d0d2b49428bc12387215e062d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/58508985530.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/the_curated_wardrobe_reviews.pdfIn PDF document text
    • https://d4508431-0eee-4913-ac2a-2ec907ed9b18.filesusr.com/ugd/12daa7_ad64cfbcbf9c41fc951d8d0784789b1e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/80927230350.pdfIn PDF document text
    • https://6b52f5a6-db44-4d3e-8337-ab33c729cb13.filesusr.com/ugd/f4de5e_4cad306d5d004dfda8fa812ecd02ab42.pdf?index=trueIn PDF document text
    • https://9e2b3e3a-6a02-4d3b-8ba9-5acc01041672.filesusr.com/ugd/66c878_d3249b69696140a4add0957589d681fb.pdf?index=trueIn PDF document text
    • https://07d68bf2-0661-47e2-9ffe-eae068a071af.filesusr.com/ugd/fef806_dd2a03b77bf84b829d078a6fc65e27bb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/16097024211.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_off0000f31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31A 4804 bytes
SHA-256: 562ee5405e9dc7eb2d9a64eb5d365e80671ef4d85c6a182c4f3db5abb7479ed3
font_01_sfnt_off0001034b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034B 10704 bytes
SHA-256: 95a33888d6dd31c469ad746a6b7a3d9629bfd02c1b45170f2627cf20c1b050b6

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