Malicious PDF — malware analysis report

Static analysis result for SHA-256 820549f8481f84a8…

MALICIOUS

PDF

65.6 KB Created: 2021-05-01 00:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 782958b5600e5cf145ccb2c407103df6 SHA-1: cd0a71f62f1c0aa07ceb89cf91b8c79c63605b92 SHA-256: 820549f8481f84a8ea72f2e56dcdb4228e1a9254f66de398792833634103dc60
184 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO spamming operation. One prominent URL, 'https://midufefew.ru/strik?utm_term=air+force+1+white+size+6+junior', is presented in a way that mimics a search result, likely to trick users into clicking. The ClamAV detection and ML classifier also indicate malicious intent, specifically related to phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7999

Heuristics 5

  • 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
  • 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://midufefew.ru/strik?utm_term=air+force+1+white+size+6+junior PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389599/normal_604a104d22de2.pdfIn PDF document text
    • http://thelandofbadideas.com/automatic_guided_vehicle_systemssmfue.pdfIn PDF document text
    • http://steblin.pro/what_is_economic_downturnkzrnu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421770/normal_6054ce4d9cf0e.pdfIn PDF document text
    • https://bemiredo.weebly.com/uploads/1/3/5/3/135322707/6503358.pdfIn PDF document text
    • https://jujepuwajepoxox.weebly.com/uploads/1/3/4/4/134466337/5314247.pdfIn PDF document text
    • https://fifusikusivupe.weebly.com/uploads/1/3/4/6/134638905/nuvokixorisupujaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474997/normal_601bcc5574d9c.pdfIn PDF document text
    • https://wetogukonitama.weebly.com/uploads/1/3/3/9/133997956/lutefesinapunal-sizurobivanip-vubuxejimi.pdfIn PDF document text
    • http://raifaisentgo.online/is_betty_crocker_decorating_icing_gluten_freejsndv.pdfIn PDF document text
    • http://quickpapp.online/gusimuletibanewjzak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493589/normal_603e27e34139d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475570/normal_5fe98e58e59fa.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/pusori/julakotetozobus.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/navy_correspondence_manual_endorsement_letter.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/dipalomozawobixaf.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/zubejitu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c15d3c9-c585-4a00-a2f2-ab86fb551686/51686359175.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/157e3625-47fe-4c46-a684-d1b688bb4011/what_does_the_bible_say_about_time_and_seasons.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90111d65-14b8-47e3-b004-16c0a9a948d1/parts_of_speech_exercises_with_answers_for_grade_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f228ded-8850-4125-8f82-74737658df24/bupun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b12c672-7e6b-48c4-b66f-6e98504a12ed/pagaduvudumesufenemevus.pdfIn PDF document text
    • https://s3.amazonaws.com/dagasopones/confidant_guide_iwai.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4444f3ff-c778-4960-8d38-07f76a737d5b/saselipivokewolojemaxod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ca50fc0-ff3a-4a89-bdca-0bd957b27b48/44629817671.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b44af5b-3f57-46c8-8be8-ee758be01051/gejawuwi.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CF 5140 bytes
SHA-256: 9200fd31a64dc8fc204aa5d06c5436a151ae440c88280beefdf5cef41cd983db

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