Malicious PDF — malware analysis report

Static analysis result for SHA-256 295f1ce023f16750…

MALICIOUS

PDF

69.5 KB Created: 2020-11-10 10:28:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7471be8eb91e9790720d7e079438180 SHA-1: 93f5fe1f0d69be336daaa05bb84531ff44d60d69 SHA-256: 295f1ce023f16750d03ecf5e16bd156c61b4e12c1cada74d245f2d7eb33629b0
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic identifying it as a PDF SEO link farm. One prominent URL, 'https://traffine.ru/strik?keyword=eureka+math+grade+3+answer+key', is presented as a lure for an answer key. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffine.ru/strik?keyword=eureka+math+grade+3+answer+key
    • https://dokodajibebabek.weebly.com/uploads/1/3/2/3/132302773/51cf09cde3eb3b4.pdf
    • https://jugoruzaja.weebly.com/uploads/1/3/1/4/131407370/wosapoxir.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/65d6dad7-a2b0-460b-843b-90536afa5bd8/19739535325.pdf
    • https://s3.amazonaws.com/gifojuxaxeva/possessive_adjectives_exercises_with_answers.pdf
    • https://uploads.strikinglycdn.com/files/1f2d0539-6f60-4b40-b759-66e5518f530d/39549521704.pdf
    • https://s3.amazonaws.com/zupenafud/tapiginebenunamegazime.pdf
    • https://s3.amazonaws.com/kufazete/the_road_by_cormac_mccarthy_summary.pdf
    • https://s3.amazonaws.com/wisatutadi/tajipekibawufo.pdf
    • https://uploads.strikinglycdn.com/files/676b1445-bc8e-4f4d-b003-6cea933ece6d/55789999418.pdf
    • https://s3.amazonaws.com/palevijuj/fidusaferebovinapovuzuzez.pdf
    • https://uploads.strikinglycdn.com/files/09ad60b1-4d1b-4f6b-9d5a-462287f312c3/76161841744.pdf
    • https://s3.amazonaws.com/xanebavifamopez/62790403675.pdf
    • https://s3.amazonaws.com/jeromopelurab/refafifipaguxanamelal.pdf
    • https://s3.amazonaws.com/purixifusipelid/ncaa_division_1_manual_2018-19.pdf
    • https://s3.amazonaws.com/gupuso/81153359335.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1f6.bin
d130da031771ffeedfc0577b40fbeee52d211af568428a4eee7fc3edde88ea6d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F6 5584 bytes
font_01_sfnt_off0000e4e2.bin
4725bf09d905db0dc0fac3a701a758eb25875fc6139147a78da4d68ff1584b47
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E2 10712 bytes