Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3798f3ff53e6388…

MALICIOUS

PDF

78.5 KB Created: 2021-05-25 14:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 04d0773b42df466597066db57f94f5fb SHA-1: c285ef37cc0d19083e327387d0510054db59a0d5 SHA-256: c3798f3ff53e638837d6f2c63d6a52e917d9f4d456962bda3b5fa1525a437841
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://jacksth.ru/strik?utm_term=playing+to+win+how+strategy+really+works+ppt PDF link annotation
    • https://lusovajilabijix.weebly.com/uploads/1/3/5/3/135351537/befamawagexupuxole.pdfIn PDF document text
    • https://rawiranuxox.weebly.com/uploads/1/3/4/6/134618620/bedutim_xagojodu.pdfIn PDF document text
    • https://paxisiluju.weebly.com/uploads/1/3/1/8/131858156/radefaditofuj_ranutejabewolo.pdfIn PDF document text
    • https://jukuzowak.weebly.com/uploads/1/3/1/3/131379830/b33a3220.pdfIn PDF document text
    • https://nisutezobeta.weebly.com/uploads/1/3/4/4/134486685/jitazisiwoko_wexiduwab_dopusoduzowog_galaguj.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/tolivajupeku/digokabagoronepifuf.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/does_sonic_have_chocolate_soft_serve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d99a3afa-2d5a-4995-be06-51305b358312/ximabemu.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/machinist_calculator_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5da49ad6-0955-45fc-8074-ac5c5ff715f5/percy_jackson_movie_collection_download_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/cyberflix_tv_for_ios.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/tovalu.pdfIn PDF document text
    • https://s3.amazonaws.com/dipafuxe/70020483974.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e56cbab9-de49-4e8d-8548-45c05219023e/halo_bassinest_swivel_sleeper_bassinet_buttons.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a3c829a-9dfb-45b7-89e0-322f3c2e9460/what_are_all_of_the_call_of_duty_games_in_order.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/watusi_whatsapp_android.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_off0000f221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF221 5340 bytes
SHA-256: 1a7a215a5bf156747a781180b486bc3bf4554e302762473c3aab3051a4775719
font_01_sfnt_off0001045e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045E 11412 bytes
SHA-256: a63ee27d7ee5c916c6294e68473a04b8f2a046fe801314298a8c47ed8b71c122

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