Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d3a2a2ffa55929c…

MALICIOUS

PDF

79.7 KB Created: 2021-02-24 08:19:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: aa44192b8c2c868c8f78d1e9476def13 SHA-1: 9300e5f41a31528f11b2ede5d1db662029130bdf SHA-256: 7d3a2a2ffa55929c8f52306489a60fc9061cc7a83939849179f82930e970f1ce
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating a malicious redirector link to 'crophysi.ru'. ClamAV also detected the file as 'Pdf.Phishing.Trojan'. While no scripts were extracted, the presence of a malicious URL strongly suggests an attempt to lure the user to a compromised site, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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/strik?utm_term=karcher+pressure+washer+hose+keeps+coming+off In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368762/normal_6033393409d10.pdfIn PDF document text
    • https://cdn.sqhk.co/loboremetoxe/dhju3vr/puzzle_star_bt21_mod_apk_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484097/normal_5ff755c5deff0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449170/normal_603259ba8f338.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391599/normal_5fd1c2906d5da.pdfIn PDF document text
    • http://216tilford.com/nilezodurijey015p.pdfIn PDF document text
    • https://cdn.sqhk.co/guwaloxipete/SPhhheB/barcelona_calendar_of_events_may_2019.pdfIn PDF document text
    • http://esplus.pro/35918828617jhdsr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372955/normal_6035ce74b457f.pdfIn PDF document text
    • https://cdn.sqhk.co/girewobo/KjfJDif/74517097001.pdfIn PDF document text
    • https://cdn.sqhk.co/zapajugadira/ibZUNhc/63506086609.pdfIn PDF document text
    • http://thrivewebs.com/77288304183vugll.pdfIn PDF document text
    • https://cdn.sqhk.co/dovawowo/whcbECr/15089125065.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504788/normal_600c8ce9701cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451544/normal_602afc0772da3.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/bivanud/tuzasedevejeni.pdfIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/fepezifinojew.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/cisco_asa_5500_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/wejabipujowusikigizodu.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/gurij.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/formal_articulation_assessment.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/murusofupokopulibutubi.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_off0000f8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DF 5520 bytes
SHA-256: 2f26035484a7d42c1b6a19bdbc0faaa3a324468dae0124f4573ffae82173a66d
font_01_sfnt_off00010b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B99 11072 bytes
SHA-256: 2013a74a1be4fcaa283b3b02d529f96b24e68972cdb4a3b507d66fb99c8ff394

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