Malicious PDF — malware analysis report

Static analysis result for SHA-256 94651d0b6c0903c5…

MALICIOUS

PDF

72.1 KB Created: 2021-03-19 17:33:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: dc06e8435a975a7ff7aa3690743caef4 SHA-1: aa320e7225991efc362bee6d7f7ea1c91a491d13 SHA-256: 94651d0b6c0903c545a78e9fd9fe081e548df7188cb3730f5535c581c2970990
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, with a significant number pointing to disposable hosting and potentially malicious domains, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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.
  • 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://vilenefex.ru/wix?keyword=festool+router+edge+guide PDF link annotation
    • https://cdn.sqhk.co/fogibadeku/vggcKji/buwejufexilelepab.pdfIn PDF document text
    • https://cdn.sqhk.co/dodufiruw/jgj7hiB/pirate_battle_sound_effects.pdfIn PDF document text
    • http://kiparegazeratax.getenjoyment.net/kuvul.pdfIn PDF document text
    • https://cdn.sqhk.co/xotakuzazuf/g2g5Eif/graphing_lines_in_standard_form_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/texojijoraso/QTpZhf7/lulepatafe.pdfIn PDF document text
    • http://yachts-4-sale.com/consumer_behavior_building_marketing_strategy_11th_editionkwp0s.pdfIn PDF document text
    • https://cdn.sqhk.co/vasegodesazu/hdjcigR/pugujekugurox.pdfIn PDF document text
    • http://adachivia.store/possessive_nouns_exercises_with_answersfat27.pdfIn PDF document text
    • http://pitushok.space/ruger_mini_14_serial_numbers_582rcdwf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/remavuj/buzetekizefe.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/how_to_calculate_oxygen_consumption_per_hour.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/125d75f3-0406-4796-9d13-7ebb02f6fa13/wegevusi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03c7c320-2a0c-44c7-8571-f5e79a3d89fe/does_ipod_touch_have_wireless_charging.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f4d5b6b-cbee-4ee7-acac-8c39689cda5e/best_master_of_orion_game.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/how_to_add_salt_to_a_kenmore_water_softener.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2a6e383-e863-4446-816d-940c0841ceeb/what_was_north_korea_before_kim_il_sung.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64313f3f-4a4b-44cd-9c82-aa4b39834c89/sewevuwabavitixukukupox.pdfIn PDF document text
    • https://eb40363d-1d1f-4170-a897-f23f0f433116.filesusr.com/ugd/2a1429_1b8196d086d74ba288a98ba1f07f8066.pdf?index=trueIn PDF document text
    • http://zewadomi.myartsonline.com/tufifirixosexuvufufuso.pdfIn PDF document text
    • https://2a497570-3881-454f-aefc-229a18bbdf22.filesusr.com/ugd/83e24f_a1e0c37c588543c99338d246b38d97ac.pdf?index=trueIn PDF document text
    • https://f730d15c-1921-46d2-b6d4-288333e40990.filesusr.com/ugd/e2c223_d8f5919f5c2645e6b441b894fdc60782.pdf?index=trueIn PDF document text
    • https://d7179dab-c972-4501-9f4a-16044ca71e84.filesusr.com/ugd/434f74_b8e705bc60ad4072b52310a18471448f.pdf?index=trueIn PDF document text
    • https://7fca5364-97a1-4441-b76e-d2c429a59218.filesusr.com/ugd/735424_1c8aaa5c9c264f2ca8efbf27e986c62c.pdf?index=trueIn 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_off0000dc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5B 4736 bytes
SHA-256: 2bb0ea74b8cef2b8cdbd51257a69c5aba0358cc1782f84f04b9dcf4ae15b259d
font_01_sfnt_off0000ec88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC88 11300 bytes
SHA-256: 332f56fdecca4dfcc621411f55dfa33aba8577174e17c65b757d591c763cd97a