Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b9643b3ebc197e6…

MALICIOUS

PDF

71.8 KB Created: 2021-04-10 21:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 78f04dd2628f8fe2d78912acdb6480a0 SHA-1: aae9f1ff8d0ab70cd6b206e1315ecca998546691 SHA-256: 1b9643b3ebc197e649fefe8e019ad72efc21920076539e9845f57f9af93a2a8b
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 0.9997

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://crophysi.ru/strik?utm_term=modo+de+produccion+esclavista+y+sus+caracteristicas PDF link annotation
    • https://jebezowurexa.weebly.com/uploads/1/3/4/5/134576847/2114539.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480584/normal_602264dd896ee.pdfIn PDF document text
    • http://checkmycredit.info/honda_civic_2012_service_manual_downloadyuv1n.pdfIn PDF document text
    • https://xibowawagapuj.weebly.com/uploads/1/3/1/3/131383975/werija_zudawanepuwi_ninifufarel_pumijoxol.pdfIn PDF document text
    • https://pimejowutaviju.weebly.com/uploads/1/3/4/4/134495028/bivufa_jugobo_jipule.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455396/normal_5fef4da2acfa4.pdfIn PDF document text
    • http://worldhold.online/jafenubisiwoxozelufao420h.pdfIn PDF document text
    • http://lovechat24.club/auditing_assurance_and_ethics_handbook_2020ytve2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2e8e3215-33bf-4fe1-bc67-b38dac560527.filesusr.com/ugd/269bb8_0b1218bc66364c1b975f9738ad09b8d4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ragejufa/anybody_can_dance_movie.pdfIn PDF document text
    • https://e791dc30-71fd-4519-a75e-453748eb9c32.filesusr.com/ugd/8a5fcf_89a68c6c089e4b65b7456b5b8978ae35.pdf?index=trueIn PDF document text
    • https://fb79ad55-22b5-4823-9538-35c71bbbd514.filesusr.com/ugd/ea423f_6df0b8bc4d8e46898c08add3a0d805e8.pdf?index=trueIn PDF document text
    • https://5c2cca0d-3a4e-48b0-93bf-8ac6c0c026cb.filesusr.com/ugd/271e65_d667768c0ce1453db55e67e37ffdd259.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gebukil/best_linux_kernel_programming_book.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_off0000d948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD948 5232 bytes
SHA-256: 192ac3826e0637dafceb9ca3d728a54b34f08a1991b5f29398d159900c74fe1c
font_01_sfnt_off0000eb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3E 12192 bytes
SHA-256: eb524fe58210d69eed12abaf11273bb061ed17c00d36a8d42064721214100944

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