Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fdad2d957231a09…

MALICIOUS

PDF

77.0 KB Created: 2021-03-06 06:47:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5fec3743e2be8d304fe7abff80e9c59d SHA-1: d8d73a055fa90358a1c8ea5cec2b9e8373a2dd9d SHA-256: 1fdad2d957231a09975ed6bc6dc15c1300c23de25a81103ade1e7748692bba5e
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are likely part of a link farm designed to manipulate search engine results. One prominent URL, https://ponafet.ru/strik?utm_term=how+much+is+dr+michael+burry+worth, is directly linked to a phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

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-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://ponafet.ru/strik?utm_term=how+much+is+dr+michael+burry+worth
    • https://cdn-cms.f-static.net/uploads/4425768/normal_5fe6eb63a14af.pdf
    • https://cdn.sqhk.co/solalokazili/jciiFig/crash_drive_2_mod_apk_3._70.pdf
    • https://static.s123-cdn-static.com/uploads/4369911/normal_60041668e8089.pdf
    • https://cdn.sqhk.co/letopoto/ochigpu/pocket_rally_mod_apk_happymod.pdf
    • https://cdn.sqhk.co/budajawisore/hjgjeha/cure_incomplete_bowel_movements.pdf
    • https://cdn.sqhk.co/besuduxikuvo/hihjj4t/goodreads_sign_in.pdf
    • https://static.s123-cdn-static.com/uploads/4448341/normal_5fde672bb61ef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8e3e609a-259e-45cb-81b7-fbb2a3526475/24466314557.pdf
    • https://uploads.strikinglycdn.com/files/72fc05b7-2dd7-4c25-87a1-f426ef21cdbc/how_to_use_foodsaver_vacuum_sealer_accessories.pdf
    • https://s3.amazonaws.com/wuxupewu/not_to_answer_meaning.pdf
    • https://b01cffea-7a05-49e8-9781-04202a21c04b.filesusr.com/ugd/d5d855_728271955bf84ed78f287c4fe96b2edf.pdf?index=true
    • https://s3.amazonaws.com/bagokiko/4141672675.pdf
    • https://s3.amazonaws.com/sesijesule/26241376359.pdf
    • https://uploads.strikinglycdn.com/files/e5a8c9d6-2f77-4ba9-91e1-a77aaa206941/pdf_converter_professional_for_windows_10_free_download.pdf
    • https://uploads.strikinglycdn.com/files/69f16127-c48f-4658-afca-248a4417aafb/2495715061.pdf
    • https://uploads.strikinglycdn.com/files/2093fd84-9af0-4533-806b-9fb8addd9bca/predator_4000_generator_wont_stay_running.pdf
    • https://uploads.strikinglycdn.com/files/cccc2022-0a89-4445-915c-242c04a29b05/how_much_does_it_cost_to_lease_a_honda_civic_2020.pdf
    • https://uploads.strikinglycdn.com/files/04d21640-bcb2-46f5-86e0-364d27235259/wasuzutibuxi.pdf
    • https://598a1783-db1d-4ebb-96f5-d3ad23e1e090.filesusr.com/ugd/ae99eb_9e71579777ee4ce7a76ed1df4a94bb5b.pdf?index=true
    • 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_off0000ed64.bin
626ac03676a092fea4c3fe71030f3442164267355333653a26d47359ffc76efe
pdf-font-stream PDF embedded font (sfnt) at offset 0xED64 5472 bytes
font_01_sfnt_off0000ffe4.bin
3aa32158d3a6d0635f2875b8526903d201f0ea8b41f323e1c17bfdc3de4fb060
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE4 11320 bytes