Malicious PDF — malware analysis report

Static analysis result for SHA-256 b334847216151815…

MALICIOUS

PDF

82.8 KB Created: 2021-03-18 04:32:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 88ff41c27b61a9023d839bc5c3d3a3ed SHA-1: 54f62a565c3a41ce31862e625d10e47107f07957 SHA-256: b33484721615181541f354b5f4afb02fbfd16805dce476bcfe1d4c8ab5daf083
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by heuristics as a link farm and a potential phishing/malware distribution vector. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely for phishing or to download further payloads.

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://xezojetit.ru/award?keyword=cecelia+ahern+perfect+pdf+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366982/normal_5fe84ed572105.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409246/normal_5fd8d170195e3.pdfIn PDF document text
    • http://sollabs.xyz/rifujanoipj7h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468286/normal_604fef4da6c00.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422914/normal_5ffd5454dd830.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvevalor/hjib358/64834720950.pdfIn PDF document text
    • http://sodalabs.club/powerstation_psx3eu_batteryw0i7q.pdfIn PDF document text
    • http://idealslim-italiaoficial.site/67378735160vz9fn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411937/normal_603e6f92e89b4.pdfIn PDF document text
    • https://cdn.sqhk.co/xezalagefog/cihwhdg/hexagon_terra_cotta_tile.pdfIn PDF document text
    • http://electorat.org/led_light_not_working_in_whirlpool_refrigerator1pevi.pdfIn PDF document text
    • http://thailandlove.site/18888738565avw1s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464710/normal_5fe8bcdd2d4d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387420/normal_6018e17fb21cf.pdfIn PDF document text
    • http://lavka-karamel.ru/social_democracy_meaning_in_urdumee0j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379030/normal_6002bb7eaa72c.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/ropuba/newebunulejizemasikop.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/vukimokekozefuvasinos.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/banjara_love_songs_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/dosipive/buninaviwotifedanoze.pdfIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/extent_report_relevant_codes_maven.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_off000109a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A0 4968 bytes
SHA-256: 1e132049f7be925ccf2e91330e361a0019e37b9456890f3ed49213b083b9937f
font_01_sfnt_off00011a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A80 10424 bytes
SHA-256: 9a47437a06e9032b35c1060b592a13adf25c1096002250bebb474f365bb2d1ec

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