Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d681099e589099…

MALICIOUS

PDF

76.6 KB Created: 2021-01-22 06:38:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 58a1194258df5be13b7173a536b0fbdf SHA-1: f990b8c1205a33a7a26e62aa605626150dea683a SHA-256: 83d681099e5890990970b9e1613dc456371a8047249a4b2b20d6b5da06cd40dc
184 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, with at least one identified as pointing to known malicious redirector infrastructure. The document's structure suggests it functions as a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

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/aws?utm_term=dark+souls+3+pyromancy+pve+guide In PDF document text
    • https://gaxatibixowoki.weebly.com/uploads/1/3/1/4/131452935/6366382.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462038/normal_5ff546a71e7a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459628/normal_5fca7450a2769.pdfIn PDF document text
    • https://furureseseruwa.weebly.com/uploads/1/3/4/4/134481841/b1dd169cbc.pdfIn PDF document text
    • https://welomutulek.weebly.com/uploads/1/3/4/8/134873792/171954.pdfIn PDF document text
    • https://zewabezasakaru.weebly.com/uploads/1/3/4/5/134593707/zanag.pdfIn PDF document text
    • https://fevegukiso.weebly.com/uploads/1/3/1/4/131482975/losefajaferebezejun.pdfIn PDF document text
    • https://site-1171753.mozfiles.com/files/1171753/30587348637.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483836/normal_5ff41842ce1c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372076/normal_5fee8d2a3c5f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387590/normal_5fd0a12534773.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/iaFkjgg/91271900814.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tejusadesivuti.epizy.com/cisco_anyconnect_mac_high_sierra.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_off0000ed84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED84 5780 bytes
SHA-256: a62de1b004950c63870c7a51ca489343d7d8e09b64a77cd0be692c59d05c660e
font_01_sfnt_off00010136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10136 10692 bytes
SHA-256: a1142ff4bf6c37f2fa6b481c0fddfd3bdf323e47b8814081499610c8b40d117a

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