Malicious PDF — malware analysis report

Static analysis result for SHA-256 09a91cb64c02a1e0…

MALICIOUS

PDF

66.1 KB Created: 2020-12-10 09:02:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 9fd793011b27df5a71fc3c0962952732 SHA-1: 55ddbb2a997ac66127abc8e6e4ca0a848b7b163b SHA-256: 09a91cb64c02a1e0d04e3ec74c91d3dd0bc5e85ee6a1d41b14e2c02973b6b6fe
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and one known malicious redirector. The document body, though heavily obfuscated, appears to be a lure for game-related content, likely to trick users into clicking the malicious links. The presence of a malicious redirector and the sheer volume of links suggest an attempt to distribute malware or phish for credentials.

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://traffking.ru/strik?utm_term=five+nights+at+freddy%2527s+2+apk+full+espa%25C3%25B1ol In PDF document text
    • https://subolamamojoga.weebly.com/uploads/1/3/4/7/134719430/sapesuneti-rusolen-javokufegejereg-dafimati.pdfIn PDF document text
    • https://poxuxeket.weebly.com/uploads/1/3/3/9/133997588/16cdb372b.pdfIn PDF document text
    • https://simixoko.weebly.com/uploads/1/3/4/8/134867908/06711ed5.pdfIn PDF document text
    • https://nizesuvijeva.weebly.com/uploads/1/3/1/6/131607023/zekawalefike.pdfIn PDF document text
    • https://jawogebewo.weebly.com/uploads/1/3/4/3/134369376/4064285.pdfIn PDF document text
    • https://fufivivol.weebly.com/uploads/1/3/0/8/130873849/tazulasepukinuno.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417806/normal_5fa91dfe7c5dc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/guwakinexowim.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdee713f75b1664399f276/1606282865391/te_amo_con_mi_vida_poema.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce08ca41ec4a2cc0e05485/t/5fcf25e2ba7003536ea53023/1607411171398/momopogu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fc3c1e9-4ad8-4c56-a47a-e0d5e9a0d70c/90714947710.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dbf60ba-463b-4e80-b463-ec1014c22d49/see_it_bigger_daily_planner_2020.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_off0000bf98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF98 5860 bytes
SHA-256: 43621909146c6de019c53c15fe4b244cd96fc949380732a4853a9af63b8e13ad
font_01_sfnt_off0000d369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD369 11388 bytes
SHA-256: 8f0d16be6f378b95f2b7c8fa66a0bc8f09ddd0771d7cfb04e386980a3ea2b488

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