Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a728e5d3626f345…

MALICIOUS

PDF

73.3 KB Created: 2021-02-20 21:44:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d62800ae197ea0c561bff06dad95faae SHA-1: 2e5250db80c5a82043b1d60c18393c8df8e0ad25 SHA-256: 0a728e5d3626f345be065bb261b543b16d4d068197406519f87926352eaa4447
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs are the primary indicators of compromise, directing users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/wb?keyword=logitech%20k400r%20usb%20dongle PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370985/normal_5fdbc0447a63a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374984/normal_5fffb84549dfd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470692/normal_5ffe43a73906f.pdfIn PDF document text
    • http://believes.space/tezugevesizd1zot.pdfIn PDF document text
    • http://hallop.xyz/printable_list_of_feelings_and_emotionsi4ci3.pdfIn PDF document text
    • http://potolkilife.ru/4._snf_classroom_rules_worksheetwkqvs.pdfIn PDF document text
    • https://ferateritilew.weebly.com/uploads/1/3/4/2/134265971/7e9dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494883/normal_5fe4c28d7b526.pdfIn PDF document text
    • https://cdn.sqhk.co/tiniwakutosu/fjghhEw/32679496848.pdfIn PDF document text
    • https://safejabev.weebly.com/uploads/1/3/0/7/130739713/3579047.pdfIn PDF document text
    • http://pinerapidsrr.com/minezaferaxuzeraxabogorehek0h.pdfIn PDF document text
    • http://virona.org/warrior_weekend_meaningk1mk9.pdfIn PDF document text
    • https://cdn.sqhk.co/tememagitapo/hnnMCer/city_car_driving_download_pc_windows_8.pdfIn PDF document text
    • http://gazopulodagifus.iblogger.org/simplicity_coronet_parts_manual.pdfIn PDF document text
    • https://lewagezu.weebly.com/uploads/1/3/4/3/134369469/3a48177.pdfIn PDF document text
    • https://cdn.sqhk.co/robimovule/vvBF3if/xufubusojutogi.pdfIn PDF document text
    • http://gachihyper.xyz/bangla_chaya_chobi_freeq7282.pdfIn PDF document text
    • http://konsalting.info/luvusisonezanideragegoa1ff2.pdfIn PDF document text
    • http://zemimumaloger.iblogger.org/cloud_storage_capacity.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gamalebivufije.rf.gd/76066158664.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_off0000e17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17F 5364 bytes
SHA-256: 22ace53225253146763fae1484d61a061d30bd8f73e436adef90aec1526b6a2a
font_01_sfnt_off0000f3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BF 10536 bytes
SHA-256: 3b84edc3d6c7ec35f8399b7746cc210f4c2b32a4316d4965c409d047e79ad54b

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