Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dbc74db8a452781…

MALICIOUS

PDF

71.9 KB Created: 2020-12-28 04:51:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 324b15107e2c765ce9ac16b9cd2f832c SHA-1: 75cfe42511c916f21e8765b71d78a78114b53036 SHA-256: 9dbc74db8a452781db56fe1457bf5bdca806c412c1e40d7527c284e55f08ccbd
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic and ClamAV detection. The primary malicious URL identified is 'https://trafficel.ru/strik?utm_term=likert+scale+questionnaire+definition', which is likely used to host phishing content or distribute further malware. The document's structure and numerous external links suggest a phishing or malware distribution campaign.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafficel.ru/strik?utm_term=likert+scale+questionnaire+definition
    • https://cdn.sqhk.co/ranotigu/gd3gjhb/1875159806.pdf
    • https://cdn.sqhk.co/makubeku/jbgchul/zopadujapunogulopebemiraf.pdf
    • https://cdn.sqhk.co/ranotigu/Rhb63UF/tolomigajepalifupilulobew.pdf
    • https://cdn.sqhk.co/dekaroku/Tgijqgj/pilafu.pdf
    • https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/4a9fe5b98282.pdf
    • https://xugilatopuke.weebly.com/uploads/1/3/4/7/134746985/3dbad.pdf
    • https://cdn.sqhk.co/xurazegoba/lhgxgcR/cheat_for_among_us_guide_book.pdf
    • https://wotigutaz.weebly.com/uploads/1/3/4/3/134361511/lolopurejo_dawiguravo.pdf
    • https://cdn.sqhk.co/tokititagiwe/gyhg5kf/inputs_definition_business.pdf
    • https://cdn.sqhk.co/rojarasam/Aighh8m/diy_face_mask_filter_fabric.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/30d5095c-93b2-427e-84d4-03e0d95a40ad/pandora_one_apk_mod_apk_free_download.pdf
    • https://uploads.strikinglycdn.com/files/bc07b737-6110-4268-9a61-e5e030aa9011/dokkan_battle_color_wheel.pdf
    • https://uploads.strikinglycdn.com/files/0475cd46-8f82-4792-b280-2db34b3c5b84/asgore_piano_sheet_easy.pdf
    • https://uploads.strikinglycdn.com/files/fa9f573e-cc6c-4f87-b965-a31143f6d091/24595344641.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_off0000cb0d.bin
f59da3a9fffea540b77ae8f54481bd1ddf651f8caba037ebd68b7d6252fb7599		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0D 5144 bytes
font_01_sfnt_off0000dc9c.bin
5c2ac43c92489cd206436a2b8890f1cae61cacfd7df827f61b2491cf1311e764		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9C 4260 bytes
font_02_sfnt_off0000ecbc.bin
6623fd0c66c262e4fef7169d88fbea6b0c05930d205e9c7be15a2c61c768ac6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECBC 10964 bytes

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