Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0be71f21a7d4255…

MALICIOUS

PDF

67.0 KB Created: 2020-11-13 05:31:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc2e8d811d760e3beac303b8ed0b9398 SHA-1: aaa67093e4b6da54bbfe96070e0f1757b839ac03 SHA-256: b0be71f21a7d4255f2988282802b8afe7193b5d53072b32d3ce6177b12f780d5
214 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gettraff.ru/aws?utm_term=cosmote+tv+go+%25CF%2583%25CE%25B5+android+box
    • https://cdn-cms.f-static.net/uploads/4450890/normal_5fa19fd8d18cd.pdf
    • https://cdn-cms.f-static.net/uploads/4408989/normal_5f9dbde418095.pdf
    • https://gorokawuse.weebly.com/uploads/1/3/4/4/134489158/towevorikimola.pdf
    • https://cdn-cms.f-static.net/uploads/4366336/normal_5f872ea752935.pdf
    • https://cdn-cms.f-static.net/uploads/4372707/normal_5f9b134287768.pdf
    • https://cdn-cms.f-static.net/uploads/4408002/normal_5fa82f012c69d.pdf
    • https://cdn-cms.f-static.net/uploads/4417207/normal_5f9c4115bfcb4.pdf
    • https://cdn-cms.f-static.net/uploads/4453764/normal_5fa5a9a16597f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/76bb0841-6b9c-46c2-a2f4-906e76b219f9/what_counts_as_community_service_hours_for_high_school.pdf
    • https://s3.amazonaws.com/gixawetopoli/ebay_weekly_planner.pdf
    • https://uploads.strikinglycdn.com/files/e2aa32ad-dd0e-4d3d-b188-f001f5bc10dd/i_will_never_not_eat_a_tomato.pdf
    • https://s3.amazonaws.com/kufazete/love_action_drama_malayalam_movie_songs.pdf
    • https://uploads.strikinglycdn.com/files/d516e91c-7af8-4951-a300-e2da4fc0e406/wuvirukejok.pdf
    • https://s3.amazonaws.com/dugibabafod/42508326246.pdf
    • https://uploads.strikinglycdn.com/files/8c23f44e-e356-47f6-87a0-2a93351bdbbf/skyrim_perfectly_modded_install.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_off0000c64c.bin
f7bb37e316331f5ac09efc84530fe4e79bd3213d17803071bc4af5ee844c72ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC64C 5584 bytes
font_01_sfnt_off0000d945.bin
9bfb8baace6ce79d5fe660b5f3900027b0425dee15e320623c956c226c8ddf1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD945 10676 bytes

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