Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dfb1ce6e69afbbd…

MALICIOUS

PDF

74.8 KB Created: 2021-01-01 05:10:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ec324fac353744f7a94cc8ee36d0583c SHA-1: ef42ceadda0035e54aae6e7c3144c084cabac071 SHA-256: 5dfb1ce6e69afbbde0e0c45172b512bee592db076c8e35f46575fca780bb0390
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs, with a significant number pointing to disposable hosting services, suggesting an attempt to distribute traffic or host malicious content. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate effort to create a network of links, likely for SEO manipulation or to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/strik?utm_term=guidebook+definition+in+business+communication PDF link annotation
    • https://cdn.sqhk.co/parapirer/iidiiot/42066970054.pdfIn PDF document text
    • https://pobezewimo.weebly.com/uploads/1/3/2/6/132681951/bbdefeefd6.pdfIn PDF document text
    • https://jupavovol.weebly.com/uploads/1/3/4/3/134314217/473c4.pdfIn PDF document text
    • https://cdn.sqhk.co/rusefijow/hiFqSgi/had_a_bad_day_lyrics_fuel.pdfIn PDF document text
    • https://cdn.sqhk.co/sixepatexup/iihdujh/saxut.pdfIn PDF document text
    • https://xarefiliji.weebly.com/uploads/1/3/4/7/134735925/lowuzezudakilo-kiginizib-vekewupoxobedud-pejajoz.pdfIn PDF document text
    • https://duwobimisenuzo.weebly.com/uploads/1/3/4/6/134615726/zewenutigifu_kugajuvipeful.pdfIn PDF document text
    • https://torawatuxopo.weebly.com/uploads/1/3/4/3/134379163/jodazizi_jemefe_duteluguxufilo_mafuwugalis.pdfIn PDF document text
    • https://cdn.sqhk.co/sebudesusoj/vdpPgfz/line_camera_photo_editor_free_download.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/gekixadonuru/free_monthly_expenses_excel_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92694d2f-a289-4280-bd18-7c400e4578b8/muduvoduxuxulebelab.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/secret_achievements_cookie_clicker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46d83d93-6584-4e1a-a6af-0123ce9ad525/20th_wedding_anniversary_gifts_for_couples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f02ba6a3-8f88-40a7-8285-ae774738f4c3/46393142665.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/lc_bird_clubs.pdfIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/macromedia_dreamweaver_8_for_windows_10.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_off0000e966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE966 5276 bytes
SHA-256: 559583f4a07dbd27c35686d390af269a5ba258bda26d356f71a961a9a9e8b37b
font_01_sfnt_off0000fb50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB50 10052 bytes
SHA-256: 22646afd000247de877225db4e8c7e8a7391912b322d6846c30df95ec9bb844d

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