Malicious PDF — malware analysis report

Static analysis result for SHA-256 304fc1e7a187ad5e…

MALICIOUS

PDF

78.0 KB Created: 2021-03-17 07:50:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 6cd6689c8607639e1b2ab317e50512f1 SHA-1: 1a2a7d13d530296d4b3c3b789f317b4868cad11d SHA-256: 304fc1e7a187ad5ee76781583f4662ddf5e97b7669337704e690808d1a9e3988
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The primary URL, 'https://xezojetit.ru/strik?utm_term=what+do+chemoreceptors+detect', appears to be part of a phishing lure, masquerading as a search result.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/strik?utm_term=what+do+chemoreceptors+detect PDF link annotation
    • https://bilimetib.weebly.com/uploads/1/3/4/4/134435282/kasasesa_budaneserajofe_muduguso.pdfIn PDF document text
    • https://ronunafo.weebly.com/uploads/1/3/1/8/131856498/cecec.pdfIn PDF document text
    • https://wirimodarezekas.weebly.com/uploads/1/3/5/3/135314182/9665596.pdfIn PDF document text
    • http://dapisamifo.22web.org/kokovodawejobawi.pdfIn PDF document text
    • https://vukajikabazaxeg.weebly.com/uploads/1/3/4/7/134711597/028b4c4455527.pdfIn PDF document text
    • https://silepokow.weebly.com/uploads/1/3/4/3/134366863/8839604.pdfIn PDF document text
    • https://golagunowij.weebly.com/uploads/1/3/2/6/132695575/2250568.pdfIn PDF document text
    • https://dokegofixak.weebly.com/uploads/1/3/0/8/130873830/8955468.pdfIn PDF document text
    • https://pogusunuj.weebly.com/uploads/1/3/4/8/134874329/seriwov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xumizaxojumiko.epizy.com/notre_dame_fight_song_clarinet_sheet_music.pdfIn PDF document text
    • http://wavexijazibivat.myartsonline.com/40926928273.pdfIn PDF document text
    • http://kigokigaruv.myartsonline.com/77598900823.pdfIn PDF document text
    • http://pijularof.epizy.com/fegifinagitegosewowuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9f8ddfd-463e-4000-80e2-cd2398d9fc79/where_to_donate_used_furniture_in_orange_county_ca.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/affirmative_tu_commands_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44abecab-f75e-4b7c-b3e2-7f586725450a/is_vortex_good_for_skyrim_se.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9c4d284-f43e-43c0-a4a5-bfe2e53c69e3/32029855857.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/the_umbrella_academy_comic_vanya_and_diego.pdfIn 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_off0000f6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BC 5296 bytes
SHA-256: bcefd8afa49ab371a9355c3d18cc5c4e35d729ffab8660e409d7a4bb75c6422b
font_01_sfnt_off0001089b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089B 9936 bytes
SHA-256: eb4b7405d1517fa3ea33a0616fbfb3abace55072be9923c059a014073d21aad6

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