Malicious PDF — malware analysis report

Static analysis result for SHA-256 c393b729c13ee91f…

MALICIOUS

PDF

78.4 KB Created: 2021-03-14 15:09:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 3c20b1f2f77775325646cd17d2146df5 SHA-1: 61e4f7eb906cdab6cc239ad0d306ef1456f0f787 SHA-256: c393b729c13ee91fa34556bd7d072a1f39003eb22a49e785fd487ed353d9df29
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. The document contains a large number of external links, indicating a link farm or SEO manipulation tactic. The primary purpose appears to be directing users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://druttle.ru/award?keyword=biosecurity+in+poultry+production+pdf PDF link annotation
    • http://vumamanepu.sportsontheweb.net/affidavit_format_for_name_spelling_mistake.pdfIn PDF document text
    • https://netajetuz.weebly.com/uploads/1/3/4/6/134651380/c0ecab6002c.pdfIn PDF document text
    • http://gejikojaki.scienceontheweb.net/pokukuwufimabatol.pdfIn PDF document text
    • https://malotanedoxib.weebly.com/uploads/1/3/4/3/134314146/599d924acf13c.pdfIn PDF document text
    • https://werudugin.weebly.com/uploads/1/3/0/8/130873895/dumapejapelef.pdfIn PDF document text
    • http://zikewexer.scienceontheweb.net/truyn_kiu_nguyn_du_ng_vn_9.pdfIn PDF document text
    • http://tebapewulodafe.getenjoyment.net/shepherd_the_flock_of_god_april_2020.pdfIn PDF document text
    • https://saxisonowe.weebly.com/uploads/1/3/4/5/134508075/perek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4b67404f-136a-46a0-9cf3-151f2d38faab.filesusr.com/ugd/241fd5_8780790b07f54ae699b7dbad22b70ce1.pdf?index=trueIn PDF document text
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_553ccf9bd49744049b1ac7d52a30adaa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1a961a0-92fb-43c1-89ca-cfbd59ec20d0/pezujuwojakemowaxesezize.pdfIn PDF document text
    • https://92fed17e-af34-466b-b3fe-38cd9ef27699.filesusr.com/ugd/192d58_727b4874730f4773aec6eb422f95f369.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ca8a778-1678-41af-a08f-1eb74bafd8fd/misofukegifusojalif.pdfIn PDF document text
    • http://duvodix.myartsonline.com/mavagijamiwimomapigo.pdfIn PDF document text
    • https://d04c2b29-3777-4fe6-aaa9-ab96f87c3324.filesusr.com/ugd/43eb95_445929a7a1274390b66cfc78d156ef3c.pdf?index=trueIn PDF document text
    • http://vewawisu.onlinewebshop.net/xakaranosukoperux.pdfIn PDF document text
    • https://de2a8dfc-dc8d-4d62-be3b-f97abdd17bf6.filesusr.com/ugd/c722c2_5cadb87630b9452cb3eb1d17e85acf8e.pdf?index=trueIn 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_off0000f4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F0 5092 bytes
SHA-256: 7efd483fa169d4c440c9bbaeeca14783f69993428c7523807523bf1d15b40244
font_01_sfnt_off00010660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10660 11772 bytes
SHA-256: 92763221281786394e74a5f9e0e7137078dbdf1f9b9d6b6a86e7fc5a022a32f0

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