Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8537b467c983233…

MALICIOUS

PDF

86.1 KB Created: 2021-05-19 21:12:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f264f752d0070b8a3373d2a003c0f4e4 SHA-1: 20d3d26ef367f44c3fcf3b9edd0c3a3423ca6c2c SHA-256: f8537b467c983233ce2e07629eaa63eefacdbcee7740b1be17298e30aa973b59
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The embedded URL, 'https://dafemum.ru/strik?utm_term=how+to+prime+a+magnum+lts+17+paint+sprayer', is the primary indicator of a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest it's designed to redirect users to a malicious site, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=how+to+prime+a+magnum+lts+17+paint+sprayer
    • https://cdn-cms.f-static.net/uploads/4383471/normal_6030d8ab2224c.pdf
    • https://cdn-cms.f-static.net/uploads/4445532/normal_5fd1c190d8f94.pdf
    • https://cdn-cms.f-static.net/uploads/4418188/normal_6069ef4541ae8.pdf
    • https://static.s123-cdn-static.com/uploads/4444351/normal_5fe3b0c6e513f.pdf
    • https://cdn-cms.f-static.net/uploads/4481168/normal_5fd3869aefcf0.pdf
    • https://kenazago.weebly.com/uploads/1/3/1/0/131070597/3628553.pdf
    • https://jejalonon.weebly.com/uploads/1/3/1/6/131636908/bed53ed.pdf
    • https://negowuvezesat.weebly.com/uploads/1/3/4/8/134859399/4d82a3cbcbd574.pdf
    • https://cdn-cms.f-static.net/uploads/4472773/normal_6032e496cf045.pdf
    • https://static.s123-cdn-static.com/uploads/4365656/normal_6001bfb7c4334.pdf
    • https://jarofuzaduse.weebly.com/uploads/1/3/4/5/134502270/romowivururate.pdf
    • https://cdn-cms.f-static.net/uploads/4463812/normal_5fd7c65b2e32e.pdf
    • https://cdn-cms.f-static.net/uploads/4485016/normal_6010fccf609c3.pdf
    • https://static.s123-cdn-static.com/uploads/4409998/normal_600513b4a8c5e.pdf
    • https://vobilafulov.weebly.com/uploads/1/3/4/9/134902573/vowunadefufiletu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/muxegeza/29073874351.pdf
    • https://uploads.strikinglycdn.com/files/df89f6a1-a9c3-43ae-ad23-3f0cf8dd12e1/janipizakikiregufetikes.pdf
    • https://s3.amazonaws.com/lomogas/84663315578.pdf
    • https://uploads.strikinglycdn.com/files/6949d0ae-c5d2-44d0-8807-42a4dd9aab9c/vikux.pdf
    • https://uploads.strikinglycdn.com/files/0a98cd7a-f3ab-4fb1-9502-aad0636f54ec/degelatikolene.pdf
    • https://s3.amazonaws.com/nilafafakem/commandos_2_game_free.pdf
    • https://uploads.strikinglycdn.com/files/9df69793-0e1a-48d4-85d8-5cbb607cca7a/wheres_waldo_other_names.pdf
    • https://uploads.strikinglycdn.com/files/ff0d3141-6dbf-463d-9246-7fd19acc172b/python_for_loop_list.pdf
    • https://uploads.strikinglycdn.com/files/6c793290-8765-4094-8e07-79234681e962/public_relations_and_fundraising_manager_duties_and_responsibilities.pdf
    • https://s3.amazonaws.com/mipeboro/topar.pdf
    • https://uploads.strikinglycdn.com/files/3b6e5f03-6201-4270-9f87-8e218bfdbf6b/83967763536.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010003.bin
edf517a561ed5132c6c1d5718ac6ff9d870a00e6f43a91762fd168a2279cca75
pdf-font-stream PDF embedded font (sfnt) at offset 0x10003 6440 bytes
font_01_sfnt_off00010ff9.bin
7f1e70ec6c2429d13f6fe7f80e97cd28b8c13cb2956f53898140c03b4bb6a7d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF9 5424 bytes
font_02_sfnt_off00012275.bin
6c443c6d94179c7921e0a6ce560c874c18b25cc4b965ab0434cb539f080a546e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12275 11660 bytes