Malicious PDF — malware analysis report

Static analysis result for SHA-256 54da4d9e5c18f583…

MALICIOUS

PDF

70.2 KB Created: 2021-01-20 04:02:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3dff0ff04a2c206354f82be2d5ddc54 SHA-1: 97d3ac2d68b0148ba1ab3cde19e368dd20309189 SHA-256: 54da4d9e5c18f583cb0d371f340256cf2cae8cf67a249b397f23f0b4ef5df0fc
124 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with at least one pointing to a suspicious domain ('trafficel.ru') and another to a link farm ('cdn.sqhk.co'). The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is designed to host many links on disposable domains, a common tactic for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URLs and the overall detection profile strongly suggest it's part of a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9855

Heuristics 4

  • 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
  • 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=costco+spiral+ham+recipe
    • https://cdn.sqhk.co/lafuwexale/cjjFGgh/65174194762.pdf
    • http://puliliraforuwu.22web.org/f_c_b_full_form.pdf
    • https://cdn.sqhk.co/dutaxato/MggdPGc/triple_double_slots_cheats.pdf
    • https://dutajidadu.weebly.com/uploads/1/3/4/7/134730474/662be3d83acf.pdf
    • http://velixone.66ghz.com/aero_performance_propellers.pdf
    • https://cdn.sqhk.co/fegukajebaj/hlbifjh/2017_louisiana_football_recruits.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://mujunuge.rf.gd/medtronic_carelink_encore_programmer_manual.pdf
    • http://vonupov.epizy.com/peter_pan_original_script.pdf
    • http://folilef.rf.gd/vitemuluwurijagedimalixep.pdf
    • https://s3.amazonaws.com/davawina/general_knowledge_quiz_questions_and_answers_2018.pdf
    • http://nepanazunisemi.epizy.com/kakulikoduwikoxobete.pdf
    • http://tuwidapaj.epizy.com/community_helpers_worksheets_for_kindergarten.pdf
    • https://s3.amazonaws.com/likerajatob/cash_flow_report_in_sap_bw.pdf
    • http://mobisojew.epizy.com/genetically_modified_food_benefits_and_risks_answers.pdf
    • http://fodarevo.rf.gd/27686956083.pdf
    • https://s3.amazonaws.com/xefezesebusu/zimamobile.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d975.bin
eaaa8f83d1d132d8a3843c380ea462ef97e5a4bcb724a8d258fac762f85a7be1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD975 4876 bytes
font_01_sfnt_off0000e9ff.bin
43e121ebed9a1bdb0bb59225f7f0fd9b24b5e728a17211504a080df0e67e379d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FF 10824 bytes
font_02_sfnt_off00010ed4.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED4 4324 bytes