Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd15d4b27e9384de…

MALICIOUS

PDF

79.3 KB Created: 2021-03-14 22:29:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 50cff596902fffc7bdb4c786f1b0cd4f SHA-1: ffc8d90fe543a642ec59c8111776236cf833c3fc SHA-256: bd15d4b27e9384de326946a74595d1181f6303607c75ebd7d32b5b6b357eb05b
194 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/wix?keyword=the+elite+book+pdf PDF link annotation
    • https://gimelasu.weebly.com/uploads/1/3/4/5/134513778/6432485.pdfIn PDF document text
    • https://cdn.sqhk.co/dujovibipu/Tihhzh8/rewasol.pdfIn PDF document text
    • http://originalhallyu.com/do_fish_give_live_birth64lvp.pdfIn PDF document text
    • https://wojodusu.weebly.com/uploads/1/3/2/8/132815854/xiriwe.pdfIn PDF document text
    • https://texerazijibegu.weebly.com/uploads/1/3/5/3/135302316/benizedepo.pdfIn PDF document text
    • https://denowulak.weebly.com/uploads/1/3/3/9/133997299/merorokukavefuv.pdfIn PDF document text
    • https://cdn.sqhk.co/jelasusoved/icjhSJH/gisopunifoz.pdfIn PDF document text
    • https://susulipazelavig.weebly.com/uploads/1/3/5/3/135335994/483796.pdfIn PDF document text
    • http://ersoil.fun/305576270946dyjo.pdfIn PDF document text
    • https://cdn.sqhk.co/movozuba/hfjfBdf/98889596857.pdfIn PDF document text
    • https://cdn.sqhk.co/sesijisova/gdghigh/2_player_one_pc_games_offline.pdfIn PDF document text
    • http://usacarins.com/78145070571bj13d.pdfIn PDF document text
    • https://kojaresojew.weebly.com/uploads/1/3/4/3/134312518/9990287.pdfIn PDF document text
    • https://cdn.sqhk.co/duvetezoje/Fhjibii/43938905043.pdfIn PDF document text
    • https://jizufolikoni.weebly.com/uploads/1/3/4/3/134349493/9247448.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/77a21239-b564-4d19-b594-1b207f242bcd/trauma_informed_cognitive_behavioral_therapy_for_adults.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bcf878b-626b-44f0-ba60-7493c1b76c40/56837582877.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/wirutipagokagixob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8925225b-ef12-44f1-ac49-5c0d5653c542/614323333.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/aprender_gramatica_inglesa.pdfIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/39011491091.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/new_audit_report_emphasis_of_matter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9d7b489-40c5-4876-a8c1-7e81ebf5b022/7342193564.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_off0000faa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA3 4796 bytes
SHA-256: 77624debd793000b9509db963f5cbcccb8e9671cbe62140e1bdf80ef8ab3ec85
font_01_sfnt_off00010af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF0 10988 bytes
SHA-256: 5d6d62d8436e4759f0844065ac7144e7a9b5a1ee10a411a12de36aaf3ee55896