Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a895548b6049ef1…

MALICIOUS

PDF

67.0 KB Created: 2020-12-23 20:24:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 945a265e79305b083b6c24d295a9167a SHA-1: 7a99539dbf131323647d91962e0e6e1a678872bf SHA-256: 3a895548b6049ef1ed80c8a323d31e200ffe9d69e77b7c7c7ad53265b1775d8f
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to harmful content.

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/strik?utm_term=didi+gregorius+face+mask
    • https://cdn.sqhk.co/wemofisejaf/geji7hj/mopagepumugaxisijatudev.pdf
    • https://bolojowugupi.weebly.com/uploads/1/3/4/8/134886087/nadogatok.pdf
    • https://cdn.sqhk.co/niturunajik/IMgjabf/alter_ego_game_book_list.pdf
    • https://cdn.sqhk.co/kuxefoxo/9ghjcrc/98352490474.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kigavanus/85623185201.pdf
    • https://uploads.strikinglycdn.com/files/c98f3fb6-e401-4ea8-af73-61d36f783b86/22838994842.pdf
    • https://uploads.strikinglycdn.com/files/a5422757-cf81-493c-9df2-d40c9da46805/i_dont_even_know_unblocked.pdf
    • https://uploads.strikinglycdn.com/files/04fac589-04b0-4778-bc4a-87e01300846f/sikebowafudubopusejibufur.pdf
    • https://uploads.strikinglycdn.com/files/ce529556-6442-4385-920c-427f226977a7/the_lover_duras.pdf
    • https://uploads.strikinglycdn.com/files/5629471c-72f7-4ef3-a89a-b5d5ab3be9fc/22951862850.pdf
    • https://uploads.strikinglycdn.com/files/13bca72c-6bb4-4af1-a65a-21039f3362f0/macbeth_study_guide_act_1_scene_4.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_off0000c8c0.bin
ea4e7b04a98775c0b9990554c3bd072a31bb1306b54868b57bdc7ae80dba0112
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C0 5372 bytes
font_01_sfnt_off0000dafe.bin
d013fd0ca5bbff91483a9f4d4c9f1c4485bceb7f6da42b9f1e4d2c4b107a69e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFE 10784 bytes