Malicious PDF — malware analysis report

Static analysis result for SHA-256 15c5322aff9a7377…

MALICIOUS

PDF

86.6 KB Created: 2021-06-08 19:33:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3315a8947287129f0c1b7c3d931e5516 SHA-1: f3d049e862019be61b2ce72e5b41c09792659726 SHA-256: 15c5322aff9a7377fce8e5792a25f7670a149cff0220c06bfd1b83774c25b035
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to 'dafemum.ru', which is flagged as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dafemum.ru/123?utm_term=irr+calculation+in+excel+sheet
    • https://cdn-cms.f-static.net/uploads/4384150/normal_6026d47da17db.pdf
    • https://cdn-cms.f-static.net/uploads/4472486/normal_602b02f3f37aa.pdf
    • https://cdn-cms.f-static.net/uploads/4450721/normal_60661f512adbc.pdf
    • https://cdn-cms.f-static.net/uploads/4489042/normal_6013ca1535d21.pdf
    • https://cdn-cms.f-static.net/uploads/4376120/normal_60113a14d4ead.pdf
    • https://ferafavobob.weebly.com/uploads/1/3/4/6/134671558/rimimopi.pdf
    • https://static.s123-cdn-static.com/uploads/4503787/normal_5ff3e9422aea9.pdf
    • https://sidelajuma.weebly.com/uploads/1/3/4/3/134373989/04fe9e7fe7.pdf
    • https://cdn-cms.f-static.net/uploads/4420029/normal_606af501126e1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://uploads.strikinglycdn.com/files/c129493f-2d3a-4cdb-b517-679307845b29/72313316565.pdf
    • https://uploads.strikinglycdn.com/files/1774f4c8-b484-42f9-a736-e5740abfd152/3588474445.pdf
    • https://uploads.strikinglycdn.com/files/a6f92b8f-1e83-46ce-bfab-ead06f24b581/wonder_by_r.j._palacio_read_aloud.pdf
    • http://lulimogosan.pbworks.com/w/file/fetch/144490362/zemogugefaz.pdf
    • http://pebenuziwi.pbworks.com/w/file/fetch/144583290/weziwalewafejin.pdf
    • http://fokurid.pbworks.com/w/file/fetch/144675360/husqvarna_riding_mower_yth22v46_owners_manual.pdf
    • http://gapufipi.pbworks.com/w/file/fetch/144764217/isometric_circle_template.pdf
    • http://lopasexosew.pbworks.com/w/file/fetch/144664914/how_to_ease_a_back_muscle_spasm.pdf
    • http://fijinatuzut.pbworks.com/w/file/fetch/144605355/kymco_agility_200i_review.pdf
    • http://gexufak.pbworks.com/w/file/fetch/144604398/99024623309.pdf
    • https://uploads.strikinglycdn.com/files/df30c84a-fc46-4d33-88d6-b793e74b9ff8/what_does_the_chinese_lantern_festival_symbolize.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f80d.bin
d30cbcf9e04051e48cfa389a7ff957d39e06b3a20adca27ce508cb7a8bd7f919		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF80D 4892 bytes
font_01_sfnt_off000108a5.bin
166daba9134c8f310b5069c96032403ac849a644fa423f09f281ce7ce3413c31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108A5 11968 bytes
font_02_sfnt_off00012723.bin
e1b2681fd622c243d122a5203e3a3c4b942d8d64b786a73435e3b3652d9adc02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12723 11068 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.