Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5f66b466aadce9d…

MALICIOUS

PDF

77.2 KB Created: 2021-04-27 01:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c1a27f6c692b6b286db70ebb42c93397 SHA-1: b9194baabc7113417b487575f535592723dc68df SHA-256: e5f66b466aadce9d973a82aefc24e68498a0b53d3ddf55179c6c03fbd0aa1159
126 Risk Score

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://vilenefex.ru/strik?utm_term=wa+state+gas+tax+increase+2021 PDF link annotation
    • http://itali-big.space/short_answer_study_guide_questions_to_kill_a_mockingbird_chapters_10-11xad21.pdfIn PDF document text
    • https://cdn.sqhk.co/bujomukoda/b2licI7/hd_images_for_desktop_background_free_download.pdfIn PDF document text
    • http://bilkaita.space/61254027666yw9ul.pdfIn PDF document text
    • http://kino-vezde.ru/20975035435jl5pc.pdfIn PDF document text
    • http://autokenn.com/15724428962ne8q8.pdfIn PDF document text
    • https://bofazoxoniwepiv.weebly.com/uploads/1/3/4/4/134454835/zikudawawawovutogi.pdfIn PDF document text
    • http://axecheat6.xyz/95629659887bfbvz.pdfIn PDF document text
    • https://fukaxoxatu.weebly.com/uploads/1/3/1/4/131438517/1625576.pdfIn PDF document text
    • https://cdn.sqhk.co/nabaxifow/xibhdha/xuxefogewiz.pdfIn PDF document text
    • https://samukolapupe.weebly.com/uploads/1/3/4/0/134017142/1195954.pdfIn PDF document text
    • http://gufutaca3.xyz/622973425542pvpq.pdfIn PDF document text
    • http://igafnd.org/kefirevixopevetawi2m8mt.pdfIn PDF document text
    • http://gdztut.com/best_wireless_scale_for_weight_watchers09njk.pdfIn PDF document text
    • https://cdn.sqhk.co/woberimi/aLhgjgh/32398883268.pdfIn PDF document text
    • http://bionatur.space/reflexive_verbs_spanish_practice_quizhffwz.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/nefunupu/31449599467.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/bancomer_movil_apk_10._89.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/how_to_change_background_color_of_the_photo.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_off0000ef79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF79 5340 bytes
SHA-256: 02b78388677d3a439ff5620e4356ae94bc9564b02a8bbe15a043760bf7f39c39
font_01_sfnt_off000101d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D1 11192 bytes
SHA-256: 6b565878d2f476f1edb70d9495265726b9f6eecf340e3c28fc85e54fe5980c88