Malicious PDF — malware analysis report

Static analysis result for SHA-256 28799448089c3501…

MALICIOUS

PDF

73.9 KB Created: 2021-06-07 13:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: cef8e435e75ea8fba93aaf095f4d6cd5 SHA-1: 669e1786596f9237c3f40e5a2303861dda7c7127 SHA-256: 28799448089c3501931cec632a1dde9d7800279156431af7b68be7b46b74e355
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, with one prominent URL pointing to 'laborke.ru' and suggesting a lure related to a 'meme video template'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links to disposable hosting, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://laborke.ru/pbw?utm_term=joins+the+battle+meme+video+template PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388818/normal_602e16c595347.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465255/normal_5ff28a519ae5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470545/normal_6060dc9380827.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410674/normal_5febcf46e4ed9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450340/normal_60304c625d099.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367622/normal_5ff2b98e51bbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403946/normal_605f949b2ce81.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457311/normal_5fc8927be0bfe.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4387242/normal_60b51d28cb2e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483335/normal_5fcfb2df3a52c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378153/normal_6022498540a86.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409095/normal_60032be81d499.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://febokipup.pbworks.com/f/nijevanugibake.pdfIn PDF document text
    • http://gexufak.pbworks.com/f/types_of_solids_worksheet_answer_key.pdfIn PDF document text
    • http://tejudafo.pbworks.com/f/semijot.pdfIn PDF document text
    • http://degenazi.pbworks.com/w/file/fetch/144770742/73442581431.pdfIn PDF document text
    • http://pamotekegopa.pbworks.com/f/big_toys_direct_jeep_assembly.pdfIn PDF document text
    • http://zuwofig.pbworks.com/w/file/fetch/144536283/11569550022.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/542ac6a6-1665-4319-9a73-9b9318f9702b/34881248048.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1ccc0e6-ef8d-4d0f-8934-b74d9ae8afd5/cuisinart_dcc_1200_parts.pdfIn PDF document text
    • http://tasonupopam.pbworks.com/f/by_the_great_horn_spoon_book_report.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D3 5292 bytes
SHA-256: aa270b093fc12b221e10ea8e97d2b31b0cf010cd508f7feb5e176b8f6ac1ef05
font_01_sfnt_off0000f3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AC 11192 bytes
SHA-256: 57d361bc9458bc45af86e6347f2a920c6f064a0b2fb3c5f2c804579c693cf58d

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