Malicious PDF — malware analysis report

Static analysis result for SHA-256 02b4602ba94efab8…

MALICIOUS

PDF

77.5 KB Created: 2020-11-25 21:51:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7e6eaacadcab33c5c74c39e28fd58828 SHA-1: 780bbd99bc243981b606baf55f834cf50249986d SHA-256: 02b4602ba94efab862dc92e0b9ee2d6639c6fe54b230cb2555372f60e5190fef
222 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including links to known malicious redirectors and a link farm designed to distribute further malicious PDFs. The ML classifier and ClamAV detection strongly support a malicious verdict. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest a phishing or redirection attack designed to lead the user to download additional malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cctraff.ru/strik?utm_term=the+flinch+pdf+free+download
    • https://vedemolo.weebly.com/uploads/1/3/4/7/134702866/fazamadizolinilo.pdf
    • https://cdn-cms.f-static.net/uploads/4427094/normal_5fb2ba0562820.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/8e929c90-5105-47a0-9794-72655d36cb91/59411186238.pdf
    • https://s3.amazonaws.com/tujeviwakirawu/regice_raid_guide.pdf
    • https://s3.amazonaws.com/wixatax/cartoon_tree_trunk_template.pdf
    • https://s3.amazonaws.com/fedojigudaj/2085394691.pdf
    • https://uploads.strikinglycdn.com/files/30fde0a6-4b8d-4b2a-beca-53fb5989314c/justified_season_4_cast.pdf
    • https://uploads.strikinglycdn.com/files/dba03d3b-ac3c-4ea5-a2eb-5b3311e7960b/43623397606.pdf
    • https://uploads.strikinglycdn.com/files/3f904510-1785-4164-95ba-0cebae905c3f/wupumapov.pdf
    • https://uploads.strikinglycdn.com/files/32e030e8-ad4a-42ca-96bc-27cc5a2e6391/10.sC4B1nC4B1f_almanca_ders_kitabC4B1_cevaplarC4B1_meb_yayC4B1ncC4B1lC4B1k_a1.2.pdf
    • https://uploads.strikinglycdn.com/files/a9ce1cc6-959a-4a3b-92ed-a0dbc0cfea7a/50431790808.pdf
    • https://uploads.strikinglycdn.com/files/97d195aa-a823-4d43-9317-37e0920e2efe/world_history_from_1500_review_questions_answers.pdf
    • https://s3.amazonaws.com/kezemiradigu/rovekajotepubibotitupeto.pdf
    • https://uploads.strikinglycdn.com/files/d4a57e9f-e9d3-4c12-8d9c-4bc2b72ec854/rijisovogu.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_off0000e510.bin
a3574f8d0b89c3baf4e4d2947130ca6bbd583840587dc4783f0cd97e243b3674		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE510 4816 bytes
font_01_sfnt_off0000f55d.bin
a87d831a9301cc9431eb53959d8fe5091d0444d02c689d2de793a895ac8aefeb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF55D 10976 bytes
font_02_sfnt_off00011ab7.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB7 4324 bytes

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