Malicious PDF — malware analysis report

Static analysis result for SHA-256 d44a01e9de3ba553…

MALICIOUS

PDF

68.5 KB Created: 2021-03-28 10:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 00bb1f898da2b2b35d417e1ad24742f9 SHA-1: 13d6509e3990038f5d78aef061f3b9098f6e761a SHA-256: d44a01e9de3ba5533fa8245d1a74758bed542bf2ccbb7e3e009a07e21c6e31c9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://pelibifir.ru/strik?utm_term=t+trimpe+2002+world+of+physics+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369773/normal_5fd3bfe80c8f2.pdfIn PDF document text
    • https://rupogasonewu.weebly.com/uploads/1/3/4/6/134653860/a7a41431e86c.pdfIn PDF document text
    • http://bupadakibagada.iblogger.org/ansys_cfx_theory_guide.pdfIn PDF document text
    • https://zazalefofano.weebly.com/uploads/1/3/4/5/134578352/fadokaxizidawi-nawanuwerose-nokurot-sowibameni.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485696/normal_5fe0005186377.pdfIn PDF document text
    • https://sililojakofatef.weebly.com/uploads/1/3/2/7/132712383/faccccc7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wupafar.rf.gd/the_story_of_an_hour_summary.pdfIn PDF document text
    • https://314a97e4-cc7b-499c-a999-42b15fb65c39.filesusr.com/ugd/fa4a73_3c217c32e84549baad6f25123cc12fa6.pdf?index=trueIn PDF document text
    • https://724418e0-3ace-43c1-abd8-628b4820fc71.filesusr.com/ugd/6df952_4bfb135303a44d73adc76d05ca9a1def.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/858a5754-ee5e-4c65-8fb5-6ee1e6bcf6f5/16145562099.pdfIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/latest_version_of_ios_for_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/gonasidupij/74302612513.pdfIn PDF document text
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_2461f24d296a4eb88dac67f254b5800a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b266a8ba-1dec-4dc5-8797-c4530ac19355/control_systems_theory.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a237634-2341-4c0a-a6b3-85e4f82b017d/angel_technology_ltd.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/34298308854.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/humayun_ahmed_movie_song_mp3.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_off0000ce38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE38 5812 bytes
SHA-256: 74b0d4aa3ec6a8d2779d57555c39dcaf29af1852a48d435cff0af00116710855
font_01_sfnt_off0000e1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EB 10432 bytes
SHA-256: 0b1d7fb6a122f1c9134a01a47d7fa5d65b764f44899c96ef3effe9105a365f67

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