Malicious PDF — malware analysis report

Static analysis result for SHA-256 a52aa2a7b40e3cb0…

MALICIOUS

PDF

81.4 KB Created: 2021-03-17 14:29:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 04f814dc82df0424b4cf938ef8399434 SHA-1: 313a9a74b52e06a05da1c306ce78545bd505431b SHA-256: a52aa2a7b40e3cb0ebacce1eb2b0e3bc73fd39a7ec600de4005f57befc521ab1
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://maypoin.ru/strik?utm_term=a+study+in+scarlet+book+characters PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4443617/normal_604cb5e02e521.pdfIn PDF document text
    • http://sovuradema.medianewsonline.com/chapter_2_literature_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371495/normal_6013253f28b28.pdfIn PDF document text
    • https://cdn.sqhk.co/foradimotiri/jfqagjV/dabobirawepapesabokikitow.pdfIn PDF document text
    • http://zedakobogesa.mypressonline.com/58728542986.pdfIn PDF document text
    • https://cdn.sqhk.co/xufilisakula/fgd8agf/house_cleaning_checklist_template_for_maid.pdfIn PDF document text
    • http://gubixazolela.sportsontheweb.net/msica_techno_mix_de_los_80_y_90.pdfIn PDF document text
    • https://cdn.sqhk.co/tewokozogop/q8bRige/mad_dragon_defence_mod_apk_1._3._11.pdfIn PDF document text
    • http://reveruverof.medianewsonline.com/suwisimogusimukur.pdfIn PDF document text
    • https://cdn.sqhk.co/rasepotobami/hhjVQhg/mini_motor_racing_2._0._2_apk_obb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_107241899d2844288aec3010f5dc07d4.pdf?index=trueIn PDF document text
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_92dcb6b4997d4a62a0665c266f829522.pdf?index=trueIn PDF document text
    • https://694dae7a-2033-4a59-8b06-91ff4eec0774.filesusr.com/ugd/e1d58f_0c74ee9b296f46a2aded88692e31383d.pdf?index=trueIn PDF document text
    • https://c6926203-1eb9-401e-9afa-11f61f201807.filesusr.com/ugd/685707_9a8c02f3f4064a13b09e4a7fc946ac07.pdf?index=trueIn PDF document text
    • http://zewadomi.myartsonline.com/94043976096.pdfIn PDF document text
    • https://4cd5eafb-d261-4666-a528-29b55b1676c1.filesusr.com/ugd/8dde66_9eefc2bd70924690839630ca7cfddf6d.pdf?index=trueIn PDF document text
    • http://nakeviw.myartsonline.com/wabanef.pdfIn PDF document text
    • http://manosotidokef.myartsonline.com/english_textbook_8th_class.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35D 5204 bytes
SHA-256: b8b891715a3415a76136b9cd542747dc71204e222b98522c02dfc3d708b166ac
font_01_sfnt_off000104f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F8 11000 bytes
SHA-256: c959f99c3fb0762ffc87f2d9bc625787df6bf1a3968ba808e17e3b8b7d13c261
font_02_sfnt_off00012a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A09 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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