Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dba3115887a5bf9…

MALICIOUS

PDF

75.9 KB Created: 2021-01-07 02:34:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 644fb6f2626003f90164590cbc9360f8 SHA-1: bc16865ba30114072f6408fede5d0e6894390e37 SHA-256: 2dba3115887a5bf9da6aad5974ceb953de8a484e34cf0d7ca7258ccaf4a741f4
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to benign-looking PDFs, but also includes a suspicious URL (trafficel.ru) that is likely part of a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate maliciousness, classifying it as a phishing trojan. The document body, though heavily obfuscated, contains a question about income statement order, suggesting a lure to engage the user and direct them to malicious sites.

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://trafficel.ru/123?utm_term=which+is+the+correct+order+for+items+to+appear+on+the+income+statement%253F
    • https://tofibozuliven.weebly.com/uploads/1/3/1/1/131163910/zupazibi_suxegudedadix.pdf
    • https://cdn.sqhk.co/kemuxilajig/iaKYyij/34.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/dbcd526e-4175-447a-bfc3-2962a726a2ec/bucket_hat_pattern_free.pdf
    • https://s3.amazonaws.com/sezewu/tokagosizise.pdf
    • https://s3.amazonaws.com/retobifulipo/rixodowirofesigep.pdf
    • https://s3.amazonaws.com/fonibinaraj/gajijinovezojudosileki.pdf
    • https://s3.amazonaws.com/xomudufe/meal_planner_and_shopping_list_template.pdf
    • https://uploads.strikinglycdn.com/files/dce11547-a8d6-4567-b66c-1e863464de57/diamond_rush_temple_adventure_mod_apk.pdf
    • https://s3.amazonaws.com/jezobasit/nujowujew.pdf
    • https://uploads.strikinglycdn.com/files/720fb426-15af-40e1-b6e1-994202e060d1/tawanokuxajazakevig.pdf
    • https://s3.amazonaws.com/fewifuwu/vpn_ios_7._1._2.pdf
    • https://s3.amazonaws.com/fowikorejodi/gmail_email_templates_with_attachments.pdf
    • https://uploads.strikinglycdn.com/files/6b31d983-c8a0-4fe4-989f-248694530df2/totuviwejopavolu.pdf
    • https://s3.amazonaws.com/fowikorejodi/ph_phonics_worksheets_free.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_off0000e99e.bin
1b21358dd1b2661251f0ee76f6335c511425c5021d748537f665b7c7236ae054
pdf-font-stream PDF embedded font (sfnt) at offset 0xE99E 5520 bytes
font_01_sfnt_off0000fc43.bin
110f154a020735ae28cfa3462897ea15cfa8f157c8c09e2e6dca5d2db2575c6e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC43 11332 bytes