Malicious PDF — malware analysis report

Static analysis result for SHA-256 879a01fa8d847ec3…

MALICIOUS

PDF

73.4 KB Created: 2021-03-25 12:24:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 49fab4d3217734be2d1387cc86e3319c SHA-1: daad70a593475a2fcd490dfca3ad0f481f7e125f SHA-256: 879a01fa8d847ec3d55359468bff018537614a992a98221e5f15fbbc5b8507b3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one pointing to a suspicious domain ('seumenha.ru') that is likely part of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious content, potentially for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://seumenha.ru/wix?keyword=vvdi+key+tool+max+review
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jevelel/32330769861.pdf
    • https://7afcd0b8-98df-42a4-afe0-9544d44c9539.filesusr.com/ugd/74e9cf_17d0041ac9944d3b9fc98563af3482c1.pdf?index=true
    • https://bef89f6e-6323-4b84-ad9d-a44490bfcc4f.filesusr.com/ugd/96768c_12c044693f6f4137bdb24d07583f1008.pdf?index=true
    • https://uploads.strikinglycdn.com/files/840c55c9-6c7b-47ca-8b59-050b8ee72d02/can_you_have_a_curved_line_of_best_fit.pdf
    • https://s3.amazonaws.com/lekezaru/corona_sdk_lua.pdf
    • https://ebba3e40-d49f-4cc8-b137-373bb1124918.filesusr.com/ugd/384ea4_793d4e8c8df34f0596b9e0b1f84cfc6d.pdf?index=true
    • https://s3.amazonaws.com/migivewuwe/aahatein_agnee_instrumental_ringtone.pdf
    • https://uploads.strikinglycdn.com/files/b021bff1-106a-42d4-a2ff-7431deb5f97f/best_artificer_multiclass_5e.pdf
    • https://uploads.strikinglycdn.com/files/39158f18-6260-4b04-9020-0d8498d06917/fisher_paykel_cpap_icon_parts.pdf
    • https://uploads.strikinglycdn.com/files/efce870d-1694-46a0-b754-e8281a11a39e/mechanical_engineering_salary_uk_2019.pdf
    • https://s3.amazonaws.com/kugelilizibuwum/78071372379.pdf
    • https://be8414c4-f2d5-40c6-b8a8-1a5561a1dac7.filesusr.com/ugd/a452ea_fbfda6bf34264260855045e93861f2e9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/58442b8c-0bf7-44ab-9a5f-ac5d405ae872/pioneer_fh-x700bt_manual_espaol.pdf
    • https://s3.amazonaws.com/makumapikeze/misalimi.pdf
    • https://0dc5016f-38c0-4e11-84f4-4717e3ef4ec7.filesusr.com/ugd/4fd84c_a18bb3a385b04c6d81ead5efd7ffbfba.pdf?index=true
    • https://s3.amazonaws.com/xozeb/fawoletixuwoku.pdf
    • https://a765b249-d442-4b07-8ea9-8318d996b894.filesusr.com/ugd/902d29_725b007f93994a118696b7b657b35ce6.pdf?index=true
    • https://e966359d-176b-477a-9ad9-c314bea94227.filesusr.com/ugd/fa6f14_716bf5fc332f4f4ea489104e99e1f764.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7a0fea08-51d7-4f9f-a9ed-dc75153550d6/how_to_replace_kitchenaid_mixer_gear.pdf
    • https://uploads.strikinglycdn.com/files/f46e4822-862c-4b2b-8e67-bfa1beb18e80/the_makers_diet_revolution_reviews.pdf
    • https://s3.amazonaws.com/midaguvimabof/template_calendar_2019_cdr.pdf
    • https://dae57379-2785-4108-a223-4562ecbfc22e.filesusr.com/ugd/87ad98_b45f6f0e725f4418ae46e3276039ad12.pdf?index=true
    • https://s3.amazonaws.com/zesotat/longman_dictionary_download.pdf
    • https://s3.amazonaws.com/mefadedosuw/37764241035.pdf
    • https://uploads.strikinglycdn.com/files/6948a4f5-b965-4d79-9e48-88c877ca64aa/captive_prince_trilogy_review.pdf
    • https://uploads.strikinglycdn.com/files/460ac239-c85c-45f5-86f9-4c365135643a/50495047888.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_off0000dfa0.bin
6caf561fc7cffcdaeeb2f56274fcbe8a94d95034bd01d45c1f9b89c9d5cffff9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA0 5144 bytes
font_01_sfnt_off0000f128.bin
8724eae6b6479c313d0be468f7dd9aa53693054131fc55f83d36f472ea04f8b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF128 11532 bytes

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