Malicious PDF — malware analysis report

Static analysis result for SHA-256 8313384e46ec14a2…

MALICIOUS

PDF

77.2 KB Created: 2021-06-07 08:33:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: fd819295dae793e782ca8b98fcc21309 SHA-1: 535ce8da7ebf5ff980bad582896e15fa500a6311 SHA-256: 8313384e46ec14a2b10afd3f78b1aca44ca43d2df411cb626306b1cb6bb0dfd9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as Pdf.Phishing.Trojan. The embedded URL `https://crophysi.ru/123?utm_term=virtual+city+playground+mod+apk+free` is a strong indicator of a phishing or malware distribution attempt. The PDF structure and heuristics suggest it's designed to exploit users by directing them to this external resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://crophysi.ru/123?utm_term=virtual+city+playground+mod+apk+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366007/normal_601bbfc9ab6b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374518/normal_602a74b7ce6ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479938/normal_5ff65b17ad7db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412588/normal_602dc70e22047.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468530/normal_6001d3fd2a615.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/94193d4e-2fda-4f3a-866d-7d8748c6832c/nagan.pdfIn PDF document text
    • http://zabodovojif.pbworks.com/w/file/fetch/144721029/18634543740.pdfIn PDF document text
    • http://sejawes.pbworks.com/f/organelos_dela_celula_vegetal_y_su_funcion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ac880af-865a-4ecb-9ec4-eee1a6e082f4/how_to_apply_vehicle_stickers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d1c36e0-3261-408a-8144-b11fa8e2b70a/arachnid_electronic_dart_board_for_sale.pdfIn PDF document text
    • http://disisopaz.pbworks.com/w/file/fetch/144562353/78359584300.pdfIn PDF document text
    • http://lifelekufa.pbworks.com/f/how_to_pronounce_chinese_letters.pdfIn PDF document text
    • http://najapenoz.pbworks.com/w/file/fetch/144652800/19182471144.pdfIn PDF document text
    • http://xojifot.pbworks.com/f/borg_warner_t5_fluid_capacity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fab02f84-7afc-409d-b803-18b6e385f8f3/present_perfect_tense_and_present_perfect_progressive_exercises.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/f/what_year_4l60e_will_interchange.pdfIn PDF document text
    • http://pokatufaxi.pbworks.com/w/file/fetch/144597801/zaruxuxa.pdfIn PDF document text
    • http://rimikupababo.pbworks.com/f/mexoterilitajazika.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e03ff010-9f4a-4d49-adf6-180968e0da35/balonobolibaxixum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6333d5b-4829-4417-8a97-3cc2bb4f4eef/86046133848.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0394f94-5265-4ddb-818b-3ab5d8981b85/brother_hl-2270dw_drum_reset_procedure.pdfIn PDF document text
    • http://wigonewakil.pbworks.com/f/achyutam_keshavam_krishna_mp3_download.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_off0000ef5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5E 5428 bytes
SHA-256: d343412cd62d96d51b33ff7ab6dd518e4c2f5b94e402ab76f447cc943523f788
font_01_sfnt_off000101d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D0 11392 bytes
SHA-256: 41996d436072234d5b3d9122f6169dc0f3124f4138a53f192c95733e36eee94c

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