Malicious PDF — malware analysis report

Static analysis result for SHA-256 141f4bbae33d5671…

MALICIOUS

PDF

74.4 KB Created: 2021-03-26 06:56:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 6364aff849f3ec721a457cede9f23805 SHA-1: 5fae9a7bdc4fb60713e1f29733191afd9c8d1656 SHA-256: 141f4bbae33d56719a1b289141dcc3971cce00b9dd559d3d54e4ff4637c70bfc
194 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were extracted, the presence of numerous external URLs and the 'Download button' heuristic suggest the document's purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bologen.ru/wix?keyword=earn+to+die+2+unblocked+games+by+dylan PDF link annotation
    • http://faxixovojaja.sportsontheweb.net/what_is_the_best_robot_vacuum_in_australia.pdfIn PDF document text
    • https://cdn.sqhk.co/dukizukijire/a7gija1/wojofotidegugorita.pdfIn PDF document text
    • http://desajegurake.scienceontheweb.net/physical_science_grade_12_book.pdfIn PDF document text
    • https://cdn.sqhk.co/gederanew/ghjWhfR/kejerufaxaketi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f8ddebc-c5d7-4744-b097-069806648c22/vaniz.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/injury_report_packers.pdfIn PDF document text
    • https://db22a0a0-c6c8-4eb9-9878-037c50d93224.filesusr.com/ugd/e2b5b3_63e7aa3dc2f0430aab568fa22629644e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuniverijesud/dukesop.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/jopupexokufazejiwajisode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6db1eabb-e52f-48b7-b42a-d21a4e29fe99/46022230475.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a73c2012-b6e0-41bd-a9c2-b2e4885721bf/gizololobaredujinaputesa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e0c100c-622c-4e1b-97e0-ead20b13937e/how_to_connect_apex_digital_converter_box.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee977107-804b-4b28-832a-43bfbf516ebe/how_to_get_a_hacker_mask_in_minecraft.pdfIn PDF document text
    • http://varirojemixu.myartsonline.com/hp_42s_manual_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a87eb90-4c90-4a35-af01-f4485fb0cd89/the_collector_movie_soundtrack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aeacf3e5-d1c4-40fb-80bc-586819ef8f61/lajiwusavavobeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40da51e2-a841-4da9-beca-6cd47f277315/88317935228.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e8bbda6-be98-4b04-85e6-83e696f1ebe5/calories_in_taco_bell_chicken_soft_taco.pdfIn PDF document text
    • https://69f1164a-dcd3-4310-9fb4-3b67f03bdbb0.filesusr.com/ugd/9d7282_ea29e6827c084ac5a96923ce75c8c046.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_off0000e35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35B 5656 bytes
SHA-256: 71ba0d8051ebbe0f4275d943fabbffbc06940326dc7f5681eb2ed65a324bcf60
font_01_sfnt_off0000f68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68C 11324 bytes
SHA-256: 4bba0e6c71547c1e34378fffbbf90ce0e7c2158d943e149503ceec098849833d