Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6dfdf99d064f6e7…

MALICIOUS

PDF

68.0 KB Created: 2020-11-22 06:54:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: fae62f638a9787c0fb56c6fbf821727f SHA-1: 1ed601070b0eb9defff49322283e802dc9c55c8c SHA-256: a6dfdf99d064f6e716a5f13ea7ad00507fa2c1f13c0b3dc4e2f49f86b1a5ff4c
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by multiple critical heuristics as a malicious redirector and link farm. It contains numerous links to external websites, including one identified as a known malicious redirector. The ML classifier and ClamAV also strongly indicated maliciousness. While no scripts were extracted, the structure and embedded URLs suggest an attempt to redirect users to potentially harmful content, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffmen.ru/123?utm_term=colors+that+go+well+with+orange+brick In PDF document text
    • https://nukafubesogu.weebly.com/uploads/1/3/4/4/134463640/paxupifixu.pdfIn PDF document text
    • https://mixorone.weebly.com/uploads/1/3/1/4/131438240/efcc1bbf048f.pdfIn PDF document text
    • https://nimubawelekuf.weebly.com/uploads/1/3/4/2/134265751/segusitukusadu_veramiw.pdfIn PDF document text
    • https://gokixojegesefa.weebly.com/uploads/1/3/4/8/134864476/7492403.pdfIn PDF document text
    • https://zekuwatifakaxi.weebly.com/uploads/1/3/2/8/132815855/gelusuboduka.pdfIn PDF document text
    • https://sakuvajavabese.weebly.com/uploads/1/3/1/3/131383602/321949.pdfIn PDF document text
    • https://sutisivanopazar.weebly.com/uploads/1/3/4/3/134310164/zozojotafaledo.pdfIn PDF document text
    • https://mijisurux.weebly.com/uploads/1/3/1/0/131070147/sopapa_bibibibafuxim_najel.pdfIn PDF document text
    • https://mabanopovofed.weebly.com/uploads/1/3/1/4/131453130/balozudivusa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/554a14e8-0ede-4ba2-8074-fee271034f74/riwoxaboxeponuxisudepe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b09bf96-7c5f-4c07-acf9-eb51f277558a/mckinney_trade_days_2020_schedule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3de6b27-0d5b-47aa-b32a-d1fc3779bb03/42498910244.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5525ead1-ec66-4a97-8481-0d1771042464/42581691164.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/80773016453.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA19 5260 bytes
SHA-256: 1f5edc02254b5470d08fddb2f21784b1ac5adadccf52e499b654700f869fb526
font_01_sfnt_off0000dc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC09 11380 bytes
SHA-256: 15d60329053d65322c164efbcc57bd08143811c09d254dd4f4f713151d015362

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