Malicious PDF — malware analysis report

Static analysis result for SHA-256 7490bb22b4aa6760…

MALICIOUS

PDF

84.0 KB Created: 2021-03-07 05:11:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 7166f535c5fae672e2856caf3398fe0e SHA-1: b05dfd8430c74c8c7e7128341898e8f6e78380e5 SHA-256: 7490bb22b4aa67606fe8953df0996ba75e4ff0cd67a1b4584631785878f31c7f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to suspicious or disposable domains, indicating a link farm designed to redirect users. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification strongly suggests malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and appears to be junk data, offering no direct clues to its purpose beyond the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=smart+board+projector+flickering PDF link annotation
    • https://rakamirun.weebly.com/uploads/1/3/4/9/134904708/4923902.pdfIn PDF document text
    • http://jawazapefaxuzit.mywebcommunity.org/nordictrack_x7i_incline.pdfIn PDF document text
    • http://bikomowaxibujoj.medianewsonline.com/what_is_the_bright_twinkling_star_tonight.pdfIn PDF document text
    • https://monisobagarov.weebly.com/uploads/1/3/1/8/131856119/caadd695649.pdfIn PDF document text
    • http://vibolofisef.mywebcommunity.org/42263347102.pdfIn PDF document text
    • http://netopodimamo.mywebcommunity.org/zagurexibi.pdfIn PDF document text
    • http://dororuminaxa.mywebcommunity.org/how_to_apply_iron_on_vinyl_to_cricut_mat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/17ede2b0-3f0e-430e-a7f8-cb06b3add75c/best_pharma_mutual_funds_2020_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89c3f2cd-f257-47f6-a80b-c7621ee618dc/48310393563.pdfIn PDF document text
    • http://wesukudepabu.epizy.com/93017450433.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31ac224a-0ff7-4c56-8b14-3b733c87c096/bowexipugaxuwenalurakat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/807957e6-274b-4f49-89c3-7d772b77cc40/the_whipping_boy_movie_trailer.pdfIn PDF document text
    • http://reditavipesef.rf.gd/zugexe.pdfIn PDF document text
    • http://womejus.rf.gd/bifozaxit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a9eef20-ac14-42c9-8853-38495c6ba28e/what_is_bitcoin_for_dummies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2b0d4a6-2546-4c6e-b9e4-3f556ba14069/wenorirapufon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fcb058d-25f6-4410-b873-d26b2ecc376f/spyder_xtra_paintball_gun_caliber.pdfIn PDF document text
    • http://tulajadulixo.myartsonline.com/98438147449.pdfIn PDF document text
    • http://biradenaj.rf.gd/canales_inicos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23a47f92-e035-43e3-ad11-2096e4f90323/61203716004.pdfIn PDF document text
    • http://kelopemajidimux.epizy.com/balance_sheet_template_nz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000feb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB5 5468 bytes
SHA-256: c4dd10fad4964146b311ae59ef8ce77e6086bfaaebd64c819dabd962aaaeca2a
font_01_sfnt_off00011135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11135 10492 bytes
SHA-256: d3acfb02523905117bca26d2ad1647a01c48f4290a71303e8b3d936b55393de1
font_02_sfnt_off000134c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C4 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c