Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8d1ca5d176b0437…

MALICIOUS

PDF

72.3 KB Created: 2021-02-23 12:34:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d4f6ac85ffc3b5b70364739d25b5e640 SHA-1: 996637f12629d3b411c96a83279d535b7ca67bc2 SHA-256: c8d1ca5d176b0437b26b6ba75cfc864f93fb98663a4839ffaa076d8258eb2e78
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or SEO spam. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of these links, with one prominent URL pointing to a suspicious domain. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://maypoin.ru/123?utm_term=uft+back+pay+calculator PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368226/normal_5ff1ce29f0e14.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418565/normal_5ff61a14ec0d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419836/normal_5fecef966bba2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388619/normal_5fc5ab89bb536.pdfIn PDF document text
    • https://cdn.sqhk.co/satofurijob/thebhgH/word_cookies_special_level_vanilla.pdfIn PDF document text
    • https://cdn.sqhk.co/pubodegosog/hjguLU1/a_homemade_bug_trap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461232/normal_602c689f58eb6.pdfIn PDF document text
    • https://cdn.sqhk.co/xamewivuvus/s7jhhgK/orange_computer_game_character.pdfIn PDF document text
    • https://fajizaxaro.weebly.com/uploads/1/3/1/3/131381717/f9dc7b078b1.pdfIn PDF document text
    • https://zewemoledomuro.weebly.com/uploads/1/3/4/7/134746436/kulefifabibavadofet.pdfIn PDF document text
    • https://cdn.sqhk.co/zixagiko/hif0CPc/jopudenopuzugolakozuzinew.pdfIn PDF document text
    • https://cdn.sqhk.co/luxixumogez/ggjdvid/dual_monitor_desk_mount_white.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425237/normal_602dccdd9469e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366653/normal_6025971f8ac8c.pdfIn PDF document text
    • https://cdn.sqhk.co/vovewotutal/bkXgdgh/city_car_driver_2020_download_apk.pdfIn PDF document text
    • https://xufodikufidu.weebly.com/uploads/1/3/5/3/135382923/xikof.pdfIn PDF document text
    • https://tigasuzile.weebly.com/uploads/1/3/1/3/131379741/nawowax_radasigebopoki_dujip.pdfIn PDF document text
    • https://kaxozugusejerob.weebly.com/uploads/1/3/1/4/131452826/daverekidab.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/vonusirukete/retencion_placentaria_en_mujeres.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/vonnegut_bluebeard.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/self_pollination_and_cross_pollination.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_off0000ddcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCC 5128 bytes
SHA-256: 590dc600f540af54f7cb3f2cd800080ce824b160a58c98a3b7183b5aacd438a7
font_01_sfnt_off0000ef60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF60 10784 bytes
SHA-256: 273f80b159495629762461f7429e49e1641b2fa3e596029e0e0cb7a2209af5f3

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