Malicious PDF — malware analysis report

Static analysis result for SHA-256 2652189ae0c16452…

MALICIOUS

PDF

73.7 KB Created: 2021-04-23 19:41:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c92fb62628923267e1898ecefee0481 SHA-1: a9a78b6a96fb2218b5e9198c6eb99efb8e2db2ec SHA-256: 2652189ae0c16452de236c977423820c3cc38d18b738e854a886dd1826cc3331
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The presence of numerous external links, one of which is `https://dafemum.ru/strik?utm_term=cuisinart+fondue+pot`, suggests a link farm or phishing attempt. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dafemum.ru/strik?utm_term=cuisinart+fondue+pot
    • http://sks-expertiza.ru/puwoxt9k3i.pdf
    • http://bubble1.space/active_voice_passive_voice_questions_and_answershxlig.pdf
    • https://cdn.sqhk.co/bidelefo/bZggScK/10562925564.pdf
    • https://cdn.sqhk.co/fuvazuginu/pjcjgjg/dynamix_music_list.pdf
    • http://fukazab.mywebcommunity.org/how_much_is_amazon_echo_dot_uk.pdf
    • https://cdn.sqhk.co/solijisivono/ajdjiiN/dabaxetesaxerififabig.pdf
    • http://ketadiets.site/78141253369h22ak.pdf
    • https://cdn.sqhk.co/derilunadine/WiaO1jf/71571839715.pdf
    • http://neo-tp.ru/in_spite_of_despite_exercisesgtr4j.pdf
    • http://kalowodopole.mygamesonline.org/does_my_head_look_big_in_this_plot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://34570882-574e-4d25-8c0e-d8b9b6c2967f.filesusr.com/ugd/cb2bed_bb8455c20bec4b77b93df7954fdb24be.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ef5c008f-2f75-42be-940f-e17fc7613851/41241367784.pdf
    • https://uploads.strikinglycdn.com/files/5e466b16-3f8f-46d7-a2eb-9ac3ed5ffeb7/what_is_child_centred_practice_in_early_years.pdf
    • https://uploads.strikinglycdn.com/files/4df4fea0-5862-4da4-b4ec-a4e3a4e3dc18/99878536962.pdf
    • https://uploads.strikinglycdn.com/files/1453278c-890c-469e-8f11-ce5a2e28beb7/torajagurerijofevo.pdf
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_ce51f1d170ef4131b9cb449f5f8312ea.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1fe79484-4133-45a9-aa59-87d924c4e899/ikea_malm_bed_twin_with_drawers.pdf
    • https://5862e4ea-63a6-4c92-af93-e06d02d1a664.filesusr.com/ugd/eaa371_621a5c87a03f4f3fa95bbb775ac2b6fe.pdf?index=true
    • https://uploads.strikinglycdn.com/files/085b3160-f579-4dda-9437-aff72cf98a77/ethical_hacker_salary_in_us.pdf
    • https://uploads.strikinglycdn.com/files/52e17084-2492-40cf-9dd8-ee6213280896/daripagulinonekolotipagem.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_off0000e367.bin
30e91523ec06fcc8b7878beb3685b0d5eee368d26fac645e1fe114c62914ba39		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE367 4908 bytes
font_01_sfnt_off0000f425.bin
f9b207e61e5e04ce9f9649f4bc33bd66e675d6599f4edad8a8586beb385f4109		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF425 10548 bytes

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