Malicious PDF — malware analysis report

Static analysis result for SHA-256 68ff665a91fc7468…

MALICIOUS

PDF

73.5 KB Created: 2020-12-28 19:01:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b18d000cec7bff1f7794bb72c7136ea SHA-1: d71b827b6b798f4a2988d4fda3005ac07ea86b6e SHA-256: 68ff665a91fc74683af8fca307a8ef7e78482bd91ad72ba4a4963eaa8c1ffd63
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, many of which point to PDFs hosted on services like sqhk.co, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, appears to be a lure related to software downloads.

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://traffking.ru/strik?utm_term=best+free+music+download+app+for+windows+10
    • https://cdn.sqhk.co/pukazibat/s4JoQic/pokemon_go_plus_app_for_smartwatch.pdf
    • https://cdn.sqhk.co/tegatiwuwax/geIhjJl/busobememidugu.pdf
    • https://biwomewiwuxe.weebly.com/uploads/1/3/4/1/134131409/5024397.pdf
    • https://cdn.sqhk.co/retirijozi/giAZhSg/67597463023.pdf
    • https://cdn.sqhk.co/potasuregoz/idHheSx/89366342942.pdf
    • https://static.s123-cdn-static.com/uploads/4460463/normal_5fc45c0017f43.pdf
    • https://ribupawotomimam.weebly.com/uploads/1/3/4/6/134694318/galunela-joximawapa-jemeravamuwug.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/babetafaperaxov/god_s_creation_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/56134c74-e7f2-4993-9f87-3265781971d4/27777224269.pdf
    • https://uploads.strikinglycdn.com/files/3905b8e0-2ca6-4f63-9ebe-ca3767564583/4711629966.pdf
    • https://uploads.strikinglycdn.com/files/0aa2e9f2-a06f-467a-9df3-7fde0f5640ea/fallout_76_power_armor_paint_jobs_list.pdf
    • https://uploads.strikinglycdn.com/files/2b0c8b9a-1e01-4c58-8339-cdd7f77a560d/codakid_online_reviews.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e35a.bin
44591c9826bde182f83498753fccce4f527208be4b842ee06e376fb1f15157b7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE35A 5636 bytes
font_01_sfnt_off0000f685.bin
39c7da281d44afebee0cf7414d95bdb18d4b50dd153c50543af6cb6d7491d604
pdf-font-stream PDF embedded font (sfnt) at offset 0xF685 10172 bytes