Malicious PDF — malware analysis report

Static analysis result for SHA-256 5053957d57a7e4d5…

MALICIOUS

PDF

83.6 KB Created: 2021-04-06 18:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 2f4b61ffae5cb057ec2dd680e9cbf620 SHA-1: fb258512a04ce31167338202dcab1ef9503add63 SHA-256: 5053957d57a7e4d5830ae3c58a41aa1583b5f82dd5ff7bcdd0afd8a8deb2cb0e
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and contains an external URI pointing to a suspicious domain. The PDF is also flagged as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/strik?utm_term=casio+g+shock+watch+bands+replacement PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4529095/normal_600521bb2a3aa.pdfIn PDF document text
    • http://storergoods.site/the_ice_dragon_spearshake3cbkp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426828/normal_5ff64f8a7f873.pdfIn PDF document text
    • http://lomidal.mygamesonline.org/kinoluxuvukejikami.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413564/normal_604fd32171c02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412900/normal_602c8a2478932.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483362/normal_5fdaec859c60b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477379/normal_6019c9244872b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370547/normal_5fecb25043e5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492897/normal_602b9e10cb932.pdfIn PDF document text
    • http://it50disconto.pro/42060600851o6i5v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382620/normal_604e23446b27b.pdfIn PDF document text
    • http://kurs1.xyz/acura_mdx_maintenance_code_b139bhzl.pdfIn PDF document text
    • http://miraluvofizobe.medianewsonline.com/bugeripuloridutegala.pdfIn PDF document text
    • http://1pokypki.website/xfinity_remote_code_for_rca_roku_tvo0t0i.pdfIn PDF document text
    • http://reduslimitaly.website/95488293884k0kd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366360/normal_603ba99d857bc.pdfIn PDF document text
    • http://wafijazaxubot.iblogger.org/kirby_vacuum_repair_manual.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/ganubifirigevi/8920861166.pdfIn PDF document text
    • http://gototura.myartsonline.com/samuel_beckett_bridge_at_night.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/cedar_creek_lake_texas_fishing_report.pdfIn PDF document text
    • http://lapetagalelan.myartsonline.com/zefonenagodazituridox.pdfIn PDF document text
    • http://jedafalakax.epizy.com/polydentate_ligands.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/gusadifosexopejowi.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_off00010762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10762 5688 bytes
SHA-256: 07492c58eb8e0dc98da4992d210e6a3b25481936145bd480fede62c309d2fe17
font_01_sfnt_off00011a98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A98 10768 bytes
SHA-256: 866323014ed06cf26e30aeaf057f95b3c046127d9b1022452f0016fe301e904f

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