Malicious PDF — malware analysis report

Static analysis result for SHA-256 0077225942bde329…

MALICIOUS

PDF

81.4 KB Created: 2021-03-18 17:04:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 99ae39922f2fb825f975a49654fd1d5d SHA-1: 307bcb74acc7d9466172a499b169e6b7d275ae51 SHA-256: 0077225942bde329a000af85440cb147daa7f65b976194a13f70795d307a71cb
244 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics and an ML classifier, specifically flagging it as a link farm and a potential redirector. It contains numerous embedded URLs pointing to external PDF files, many hosted on disposable domains or potentially malicious infrastructure. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature, suggesting it's used to distribute phishing content or other malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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.
  • 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/award?keyword=html+symbols+code+list+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4407813/normal_5feff4ed0a357.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421061/normal_601ce8bcde686.pdfIn PDF document text
    • http://gepexoliv.medianewsonline.com/82955316872.pdfIn PDF document text
    • http://mitimewigupito.mypressonline.com/britax_marathon_clicktight_car_seat_installation.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490547/normal_6039fa6366db2.pdfIn PDF document text
    • http://tuduvodakep.mypressonline.com/kigodotuk.pdfIn PDF document text
    • http://gebuhrenfrei-mein.com/jopuzoganerivisedumeme02hvr.pdfIn PDF document text
    • http://rigoditibalun.mywebcommunity.org/69389342154.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383680/normal_6044f656eed9d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403687/normal_5ff64b5238abf.pdfIn PDF document text
    • http://zotikarida.medianewsonline.com/bukiverorejetopa.pdfIn PDF document text
    • http://shoppingyxplus.xyz/79866160153w0fs6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392666/normal_60384f8201a77.pdfIn PDF document text
    • http://jaxagogilexet.sportsontheweb.net/xurevifewun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492253/normal_60120bba648cd.pdfIn PDF document text
    • http://dududuw.mypressonline.com/xiwutisokirabuwuwewejade.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://womidelere.myartsonline.com/76221981266.pdfIn PDF document text
    • https://73af689e-4c80-4f62-99d3-7a886641ad81.filesusr.com/ugd/3b5dd9_ce22455f246a4ef3ac227a2ff332ff11.pdf?index=trueIn PDF document text
    • https://8f6f9f04-f977-4239-955d-f6aecf2dd879.filesusr.com/ugd/81cd61_a705a8b6e84e404b9d94e85544336e02.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_off0000e025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE025 5196 bytes
SHA-256: c751bdafaa82bb120272c00643453814941fa2b9d95d840809f86c62187396e2
font_01_sfnt_off0000f1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CA 26932 bytes
SHA-256: ef88b3f29128328ebd5cae2793a38b55cddee230cb9ca1b3ca83cea1348b928d

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