Malicious PDF — malware analysis report

Static analysis result for SHA-256 f917d836b92fb3e1…

MALICIOUS

PDF

79.2 KB Created: 2021-02-23 02:22:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 098c90cec70ce5c364d57516cdf65efc SHA-1: f78182c1aae43c17f76d5135a630c033a7266610 SHA-256: f917d836b92fb3e1879be819240e1c44548d3ed636608015ca298f7cb19bfbe3
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains and redirector infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and does not provide clear textual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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.
  • 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=mossberg+930+mods In PDF document text
    • http://stopnutristrike.ru/jubiguwepafesuxfaen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470841/normal_5fd7194e14bcf.pdfIn PDF document text
    • https://rebejudan.weebly.com/uploads/1/3/5/3/135316845/0655d503580bf04.pdfIn PDF document text
    • http://webcam-model.online/16569997611s2n3h.pdfIn PDF document text
    • http://koreanluxe.com/xekobopejejaxivavige9j323.pdfIn PDF document text
    • http://my-favshope.online/30058275845w9r9k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379048/normal_602c276bf07c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367951/normal_60164772945a3.pdfIn PDF document text
    • http://onlinetyz.xyz/ramuluzetiwomexagitizekzipnv.pdfIn PDF document text
    • http://spain50off.info/86935840230wndmg.pdfIn PDF document text
    • https://xuvivodoxanujo.weebly.com/uploads/1/3/5/3/135308848/a4bba3508e68c.pdfIn PDF document text
    • https://pepomujotopulog.weebly.com/uploads/1/3/4/8/134873529/07a173bd17.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/jolozidabi/banole.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/roland_td-3_drum_kit_price.pdfIn PDF document text
    • https://s3.amazonaws.com/xofalepelala/free_vector_wedding_invitation_templates.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_off0000f865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF865 5508 bytes
SHA-256: 2facae0ad20c062130caaaf6e6d2bd94ddc25072232a75f36fb462efa0fbc967
font_01_sfnt_off00010b0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0A 10868 bytes
SHA-256: 9f0d845210a37438d1179d26441d7c99fc03630c26a337d3fe6ecb4911ec6867

Open this report in the interactive analyzer, or submit your own file for analysis.