Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa56c3ee5011baed…

MALICIOUS

PDF

70.6 KB Created: 2021-03-03 13:49:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c3d676523e4df75af5da3a63ec93fc95 SHA-1: 288169ceed145f2c76e188c3c470076c60e413db SHA-256: fa56c3ee5011baed2d664303423b1595c5406f18e043083ddd3683baf495b2d3
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 0.9966

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://maypoin.ru/strik?utm_term=kenmore+front+load+washer+won%2527t+drain+completely PDF link annotation
    • http://wasatosu.sportsontheweb.net/philips_universal_remote_codes_for_sanyo_tv_4_digits.pdfIn PDF document text
    • http://pafunote.iblogger.org/bubojumadokulopo.pdfIn PDF document text
    • https://kipunazumalimak.weebly.com/uploads/1/3/4/7/134755782/98e87a7feaaf.pdfIn PDF document text
    • https://nuniladolu.weebly.com/uploads/1/3/0/7/130775245/fawoladi_vudazerezebar_kugaxupak_mesuvaxuwo.pdfIn PDF document text
    • https://rozogefeju.weebly.com/uploads/1/3/1/3/131398259/45ec25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477629/normal_603b9b8c40516.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
    • http://tugurodegid.rf.gd/does_lowes_carry_oreck_vacuum_bags.pdfIn PDF document text
    • http://lugirike.epizy.com/ridenerukirosu.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/burupudenebupadadexudesa.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_off0000c94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC94E 5380 bytes
SHA-256: c07a60aa222677acb062ef3aa112cd46229269913cc5452101ced412bf7c681a
font_01_sfnt_off0000db84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB84 10368 bytes
SHA-256: 0478fd8ca31ae8574cb2e4202d05e8daebde754ac264ddf56268dbe0093b19bc
font_02_sfnt_off0000fefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFE 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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