Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f3416dc0a92209c…

MALICIOUS

PDF

94.6 KB Created: 2021-03-08 18:13:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9878c60515de535bc5f00ed7af0782cb SHA-1: 1505ee195f46e3889c1336f56edea410aa084d58 SHA-256: 6f3416dc0a92209c6c1899375c7b55794f8375235639410f74e9c13788d98d87
156 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 of which are SEO-optimized and point to potentially malicious domains. The heuristic PDF_SEO_LINK_FARM indicates a link farm, and the ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URL `https://jumiwimov.ru/award?keyword=buerger+allen+exercises+pdf` is likely used to redirect the user to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/award?keyword=buerger+allen+exercises+pdf
    • https://cdn.sqhk.co/nunamarajop/igIhjdm/138009645.pdf
    • http://gazopulodagifus.iblogger.org/mustard_greens_nutritional_information.pdf
    • https://cdn.sqhk.co/xenudipu/zjehggL/espn_chicago_waddle_and_silvy_podcast.pdf
    • https://cdn.sqhk.co/tememagitapo/ghhgnD3/age_of_war_4_hacked_cheats.pdf
    • https://dixozetazexode.weebly.com/uploads/1/3/4/4/134472526/1a33ca355c7.pdf
    • https://cdn.sqhk.co/pibilebomek/pHIgghj/nujilixopewuvudoza.pdf
    • https://pegujugadul.weebly.com/uploads/1/3/1/6/131637136/36a8d4777a7a7.pdf
    • https://cdn.sqhk.co/niwonosorude/ihZhc0t/kaperozobijupukakelugu.pdf
    • https://zafigitelerom.weebly.com/uploads/1/3/4/3/134338481/dewudi-jenibesavad-rudosunos.pdf
    • https://susuravi.weebly.com/uploads/1/3/1/1/131164319/3145060e68d21f4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/d5c58ab1-938d-4735-a2b7-145e361f7f2e/46314981743.pdf
    • https://s3.amazonaws.com/gezetega/dimigiforafunetibu.pdf
    • https://s3.amazonaws.com/gajabedafot/blush_pink_sheet_set_queen.pdf
    • https://s3.amazonaws.com/wetowuzuxit/mijinawatoju.pdf
    • https://s3.amazonaws.com/gasodamuza/jefaboredidoxopulimogikap.pdf
    • https://uploads.strikinglycdn.com/files/8dfb8978-1318-4f64-a074-f5797981f7ad/how_to_transport_a_cat_on_an_airplane.pdf
    • https://s3.amazonaws.com/gorajikunobixi/midaxoduwugalogoto.pdf
    • https://uploads.strikinglycdn.com/files/64929303-7ac0-4179-8bbe-28e386694e25/d-link_dns-321_specs.pdf
    • https://uploads.strikinglycdn.com/files/26e9181c-1c0e-4912-a3ad-2d21a25a8478/78423323812.pdf
    • http://deketinak.rf.gd/rulun.pdf
    • https://s3.amazonaws.com/muvevanepen/the_lightning_thief_reading_level.pdf
    • https://uploads.strikinglycdn.com/files/6ecac148-05e1-4b3a-b93a-4d5ac4350b4a/james_baldwin_the_fire_next_time_review.pdf
    • https://s3.amazonaws.com/fixararololu/fafomukixujupirat.pdf
    • http://dekuxibasor.rf.gd/how_to_make_a_cartoon_avatar_photoshop.pdf
    • https://s3.amazonaws.com/dedinavesute/papua_new_guinea_flag_information.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011fdb.bin
112d12ff51839565155aca81d25230efb1cabcba387afde0237119044e022359		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDB 5132 bytes
font_01_sfnt_off00013161.bin
369356b915388d9c955b30ed71db86d7c38676eb1abb317dd2584deb11f3232b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13161 14080 bytes
font_02_sfnt_off00015e67.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15E67 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.