Malicious PDF — malware analysis report

Static analysis result for SHA-256 b05daebc312d0be6…

MALICIOUS

PDF

100.0 KB Created: 2021-03-02 19:57:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 85b15f45722252d997414b7607043378 SHA-1: b99482fa7fa6d81da32a8aece448808c8c964516 SHA-256: b05daebc312d0be6313e1219769aa0d7e8f48329837cbc0be765e564e0629344
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 0.9997

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://zajinet.ru/123?utm_term=what+is+the+meaning+apparatus+in+tamil+crush PDF link annotation
    • http://vumogegotawugub.mypressonline.com/john_deere_d170_loader_parts.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugavu/gkZbUjg/tagojasibike.pdfIn PDF document text
    • http://amaryllis.space/ejercicios_angulos_en_la_circunferenrgt6m.pdfIn PDF document text
    • https://cdn.sqhk.co/xatuxazaz/jgjaih4/dune_cast_2000.pdfIn PDF document text
    • http://idealslimitaly-ufficiale.site/modified_bessel_equation61fuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414152/normal_602fb80ca5d70.pdfIn PDF document text
    • https://cdn.sqhk.co/rularijulen/geNBwjf/zunemipesekuf.pdfIn PDF document text
    • https://cdn.sqhk.co/zapoboveje/Fia70Iq/68652705165.pdfIn PDF document text
    • http://igcopyrightforhelps.com/651995188410c9na.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393364/normal_5fd6a2664fbfb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452845/normal_601ca6c7d5821.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445337/normal_5ff4ecad05f03.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://fazomexaboru.rf.gd/is_it_illegal_to_kill_an_elephant_in_africa.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12467 6332 bytes
SHA-256: c4993f23a23ad463fd0b4c8fb8bd297e33b23bda818fad20ba0fd4ce240bd9e6
font_01_sfnt_off00013a29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A29 5360 bytes
SHA-256: 36bde72027d1a491de2a95c4e73044e445ad87ef27d5635b2da7cef5cc1e143c
font_02_sfnt_off00014c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C42 4460 bytes
SHA-256: d75285c1fcff426cfb651175ad513327135693474b4b4e79a9bea289c2b18444
font_03_sfnt_off00015c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C1B 11340 bytes
SHA-256: 55c6d5c953b8b00029761974a1356a79f9d77ba97dd9fcf613bd39255cfdc671

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