Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cab833216c4de41…

MALICIOUS

PDF

109.0 KB Created: 2021-03-19 16:06:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 19f673b2e3dfe7fb549a0ab20817b9bf SHA-1: 167ae6d6f3a09e86d0e12a3cb52492c4dd66b5f1 SHA-256: 1cab833216c4de41a59545132579b0559e5d4c9eb04fdc05dfdadb630b09be08
156 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 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 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.
  • 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/strik?utm_term=kenmore+elite+smartheat+quiet+pak+9+specs PDF link annotation
    • http://fewemika.66ghz.com/angulos_en_la_circunferencia_ejercicios.pdfIn PDF document text
    • https://cdn.sqhk.co/wevujawej/bJjivje/girogidupasaludisixi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382772/normal_5ff3d8741c219.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474978/normal_60334065dd79e.pdfIn PDF document text
    • https://cdn.sqhk.co/feluxolid/jS1jjij/papoki.pdfIn PDF document text
    • https://cdn.sqhk.co/fetesulatol/ijbVCHy/sorubonenamatokig.pdfIn PDF document text
    • https://cdn.sqhk.co/zatovafer/fhfkjae/94715661613.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://305aa2e3-e1d2-413d-aa2e-f1bb83d03ded.filesusr.com/ugd/92ee2b_bb3bef353bd24d2aa6d9698ab8c253ab.pdf?index=trueIn PDF document text
    • https://a2876ee3-c470-454a-91e2-e108d831033a.filesusr.com/ugd/e8dba5_7e34b11463ff4c30b3ed6300b4f67e0b.pdf?index=trueIn PDF document text
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_7394232b42d1497fa97317c339c5c054.pdf?index=trueIn PDF document text
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_2f25f8a7bd5d4206be88eb009a2c6cb9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nefagolom/68041869711.pdfIn PDF document text
    • https://s3.amazonaws.com/rizoli/chemistry_122_worksheet_chemical_equilibrium_review.pdfIn PDF document text
    • https://s3.amazonaws.com/resabomibogodaw/doro_cell_phone.pdfIn PDF document text
    • http://pegamivefeja.rf.gd/how_to_become_a_pentecostal_pastor.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/58978517081.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/nacionalismo_musical_espaol.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_off00016b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B94 5488 bytes
SHA-256: 818ba45f6ba19c37a27e7fe6c29fc5315e647ecd6881a97e713820313ebb4a60
font_01_sfnt_off00017e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E10 12092 bytes
SHA-256: 9b21726f8406ebd22b88f10ceef6f8a9c207a0fd432ca3b79d35fe3a4532b023

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