Malicious PDF — malware analysis report

Static analysis result for SHA-256 39926846873f99c4…

MALICIOUS

PDF

73.4 KB Created: 2021-02-21 23:00:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 28d91c0f54bda086c83b6dbd5fe7cda8 SHA-1: 7edf6aaee9ac241b92364b7d217b9b0f114fb33b SHA-256: 39926846873f99c4eeffd49d145b7d09dd0ea651f2cb040de774ba8a9ad26b2e
126 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to a 'Harry Potter quiz'. The presence of multiple disposable domains and link farm heuristics indicates a phishing or scam attempt designed to redirect users to malicious content.

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
  • 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://leonvi.ru/strik?utm_term=harry+potter+quiz+buzzfeed+character PDF link annotation
    • https://cdn.sqhk.co/visevunu/gfinhgk/mekagemug.pdfIn PDF document text
    • https://cdn.sqhk.co/retesixabe/hEhhjay/xoxolinusaxomosow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473047/normal_5ff235ff9d834.pdfIn PDF document text
    • http://alifan.store/the_anatomical_term_thymus_literally_means641js.pdfIn PDF document text
    • http://titoto.xyz/proses_fermentasi_alkoholzhtq7.pdfIn PDF document text
    • https://cdn.sqhk.co/tilafukefuwe/jgil1RP/xabaxivo.pdfIn PDF document text
    • http://montana-media.com/95605101801v2vbf.pdfIn PDF document text
    • http://1s.london/what_is_solo_parent_id71nph.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479237/normal_5fd12856149d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376602/normal_5ff381f728460.pdfIn PDF document text
    • https://cdn.sqhk.co/zegareguw/idHjh5t/81269751351.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeform.com/261637137971xsv.pdfIn PDF document text
    • https://cdn.sqhk.co/wavoperusina/ehcjcjg/sadeli.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A9 5188 bytes
SHA-256: cc70febcb49007c5ece6ceda813a9d7f03624253c0888e21b9848bf659c8000b
font_01_sfnt_off0000e666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE666 10624 bytes
SHA-256: c940e436ce06ae8145076492c5ba8ad741a20260de89dcf6f2183ac9461117ac
font_02_sfnt_off00010a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7A 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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