Malicious PDF — malware analysis report

Static analysis result for SHA-256 c31558efa2218fd8…

MALICIOUS

PDF

84.3 KB Created: 2021-05-06 19:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 41161dc3f2f4734764f76f239b6103a2 SHA-1: 8bca96e6214b7756cf3e1c399e73d41162ddab20 SHA-256: c31558efa2218fd856561f67c52e8aa0805c643d75fc913ea44eb6da35d7b1bc
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one pointing to a suspicious domain ('resalured.ru') and another to a link farm ('pozugazibejiku.iblogger.org'), suggesting it's part of a phishing or malware distribution campaign. The document body, though heavily obfuscated, appears to be a lure related to vehicle maintenance, a common tactic for social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/strik?utm_term=how+to+change+and+drain+the+dsg+transmission+fluid+in+our+vw+w%252F+vag+6262 PDF link annotation
    • http://pozugazibejiku.iblogger.org/juegos_del_hombre_araa_para_jugar.pdfIn PDF document text
    • https://cdn.sqhk.co/nawakema/hhgcNhd/fewotidoxegikenatine.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414869/normal_5fec432790e5a.pdfIn PDF document text
    • https://cdn.sqhk.co/tibakekavero/HjjJEgf/winiwimu.pdfIn PDF document text
    • https://cdn.sqhk.co/vozeseseber/hahgRha/30866342910.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374532/normal_605537490a33a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406170/normal_601d08b501b55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370764/normal_605ff63de302f.pdfIn PDF document text
    • http://xikibokukubis.iblogger.org/online_quran_teaching_freelancer.pdfIn PDF document text
    • https://cdn.sqhk.co/pixafosabow/6HKjgBu/gimikamuvopimabarawi.pdfIn PDF document text
    • https://cdn.sqhk.co/nivazesoj/j0FhfzW/29376991776.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sewadereweben.epizy.com/vubasejomilisawag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/453ed6d0-0b41-4017-b4df-c40faf8ad2c0/36477318733.pdfIn PDF document text
    • http://mubaviz.epizy.com/asterisk_and_install.pdfIn PDF document text
    • http://wevabotatufor.rf.gd/how_to_see_gpa_in_infinite_campus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09cfca4a-072c-41ec-b100-7a36b5931c47/beats_by_dre_studio3_wireless_over-ear_headphones_review.pdfIn PDF document text
    • https://aed022ca-8a9d-452d-9022-56a74a585a14.filesusr.com/ugd/4d548e_baeff6a4140841ac8d654b762cce06db.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d76899d-e19e-40cd-b6b6-a0fbafc890a5/23067153201.pdfIn PDF document text
    • http://ronogaso.rf.gd/leribaxikalepopaxanu.pdfIn PDF document text
    • https://dedb376b-efc3-4528-ac10-fc65d12f866c.filesusr.com/ugd/5f6074_028e8032a4004338bd00e04088867593.pdf?index=trueIn PDF document text
    • http://rezimezamuz.rf.gd/bevepisazesopa.pdfIn PDF document text
    • https://d6477b75-8e4d-4453-8bbc-a86a6009e57c.filesusr.com/ugd/261d41_59669f9e2fb34feba13bbd14f3631192.pdf?index=trueIn PDF document text
    • https://c2267750-1f6d-4c2f-944a-eb302c7f07d7.filesusr.com/ugd/93971e_3aa8b78fb93e41e4b821910e52f7df90.pdf?index=trueIn PDF document text
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_65436cb6db2d4994a499eb890f2a7d16.pdf?index=trueIn PDF document text
    • http://tapepoxawire.epizy.com/dawuliv.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_off00010770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10770 5868 bytes
SHA-256: de0137af34a5b1680947a5a01ef16cf556ff82c6a59b388c291f559bcdc9b920
font_01_sfnt_off00011b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B68 11564 bytes
SHA-256: 07ddaf6550f54e398d1c751a353deaa09ea368f7f4cb828efa11329e6163be14