Malicious PDF — malware analysis report

Static analysis result for SHA-256 57ba231b4c4f3fe8…

MALICIOUS

PDF

67.7 KB Created: 2021-02-21 00:06:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 596d6fa8293de54fbf0d6ac0b13f2f35 SHA-1: 9e6f969b9361b0afe9f026258dc42fa7da18ad11 SHA-256: 57ba231b4c4f3fe8d176d2a11d0430a9aa51ffb58809809d78c03c7a81235c1b
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://crophysi.ru/strik?utm_term=ms+paint+save+as+transparent+background PDF link annotation
    • http://sanadewa.iblogger.org/45875020081.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485322/normal_5ff97ce39cccd.pdfIn PDF document text
    • http://fuxarirudutosas.iblogger.org/platform_film_ke_gane_ajay_devgan_ke.pdfIn PDF document text
    • http://vatemuredaxusob.22web.org/rajiro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405946/normal_600fb052e245b.pdfIn PDF document text
    • http://wotanute.22web.org/ks3_maths_rounding_decimals_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/hLQwieC/34180133946.pdfIn PDF document text
    • http://fojudesekuxujef.22web.org/images_of_fc_barcelona_logo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zuxime/21959692060.pdfIn PDF document text
    • http://bobosuvediv.epizy.com/grammaire_du_franais_livre.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/river_flows_in_you_piano_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/ketinulafoluzedebatiju.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_off0000cab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB8 5480 bytes
SHA-256: ac49bd7c2bbd1c719f150f2a4411d2dffc216598aeddcc81217095fccc9a04d5
font_01_sfnt_off0000dd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD79 10788 bytes
SHA-256: 791afd684fe66b0db133e69b4f64e8ec1236539c9b1c9b68eb1e742ca3d180a5

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