Malicious PDF — malware analysis report

Static analysis result for SHA-256 eefa755c542dfcfb…

MALICIOUS

PDF

72.3 KB Created: 2021-01-03 22:24:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 55fb3f2c529d8c21690bf6dd7d2ce30b SHA-1: 1da3f8629c47961f43282ba77b07cfe06b56c4d6 SHA-256: eefa755c542dfcfb8994fcd75f182578ab76e06693729ab801849488814ef393
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The embedded URLs and the overall structure indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/123?utm_term=rpg+vx+ace+rtp+full+screen PDF link annotation
    • https://cdn.sqhk.co/vemonososepa/IjdhDij/macklemore_thrift_shop_feat_wanz_lyrics.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450430/normal_5fcaabec63d44.pdfIn PDF document text
    • https://mogazikazalag.weebly.com/uploads/1/3/4/4/134440800/df6e8bbdf2c.pdfIn PDF document text
    • https://kobizixudowizeb.weebly.com/uploads/1/3/4/4/134402546/1660716.pdfIn PDF document text
    • https://cdn.sqhk.co/kezixowog/eEO8je9/dual_approach_in_planning.pdfIn PDF document text
    • https://viwoseloza.weebly.com/uploads/1/3/4/8/134861971/2d713f3e57e94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426270/normal_5f99bd672c8d2.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/424ca531-b9ee-4127-a32c-c73783e9c92d/40432894006.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eab7d133-89ea-4840-a313-00c6697a926d/foripuga.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/layers_of_the_atmosphere_earth_science_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bde47db0-053d-4b82-bc80-9e96239aa71c/barium_and_radium_electron_configuration.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/205c7a0a-05e9-4a63-b42f-be07e21fc6a5/bugenisurutubaxabin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/195b1d22-da8d-4765-86d9-ce90ea850155/banezose.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_off0000db69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB69 5320 bytes
SHA-256: f6b81128cd0b37fbc4bd2b758f008a4d32e7b894e570dc593af2dd45a9fdb7a4
font_01_sfnt_off0000eda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA9 11924 bytes
SHA-256: d962eff8578dd53fb95a8abf83aa725348e1033b10df69b03c5ada6de4565623

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