Malicious PDF — malware analysis report

Static analysis result for SHA-256 08bb5dbb8b5fe948…

MALICIOUS

PDF

80.4 KB Created: 2021-06-11 06:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 417b333ecf9bc683e0dffdfe91dac94e SHA-1: 1e77849ab0b7931eb16035650997672e96c557e1 SHA-256: 08bb5dbb8b5fe9489dd374b7e6602fdb93bdbf6b9a3408166574ac1e0f9ec4cd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://oniceh.ru/pbw?utm_term=who+is+the+second+richest+man PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451752/normal_60b95ca727e00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381543/normal_5fda41c0df603.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4493881/normal_60b74a4b188db.pdfIn PDF document text
    • https://nalebetiraj.weebly.com/uploads/1/3/4/6/134669494/dexepopij.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4392650/normal_60afe368d99b3.pdfIn PDF document text
    • https://repepojopojak.weebly.com/uploads/1/3/5/9/135970902/e5294.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470535/normal_6007ae615460e.pdfIn PDF document text
    • https://nakakikixug.weebly.com/uploads/1/3/4/4/134490848/gadab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/378a1d8d-00b8-455e-b129-e2618581bd55/how_to_calculate_gaap_revenue.pdfIn PDF document text
    • http://refarumiba.pbworks.com/w/file/fetch/145102566/sadie_red_dead_redemption_2.pdfIn PDF document text
    • http://dizugizup.pbworks.com/w/file/fetch/145103157/boviwajumebifosam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21a74488-219a-4cc7-8e8f-b23ed1f61b05/jovijitumigugekezasu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a522100-2633-4c32-b6aa-4556ed00a589/78994757552.pdfIn PDF document text
    • http://lonazetubuz.pbworks.com/w/file/fetch/144969441/vadura.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/w/file/fetch/144426882/bolokubukawiroj.pdfIn PDF document text
    • http://fepewuwakow.pbworks.com/w/file/fetch/144502929/51634990442.pdfIn PDF document text
    • http://fevawigo.pbworks.com/f/27487568880.pdfIn PDF document text
    • http://funuvutidip.pbworks.com/w/file/fetch/144461691/anagram_solver_free_scrabble.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_off0000f9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F5 5160 bytes
SHA-256: 615ea616666d856be28294d83ed797f1abf178a8e97dc90ad40c630bae585ba1
font_01_sfnt_off00010b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5B 12924 bytes
SHA-256: e0d0328328c3c5bce8a423b35f9a99d5a1824d8e6a6dcf24ec5188736260d5b9

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