Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bd92a809a06c868…

MALICIOUS

PDF

137.5 KB Created: 2021-06-14 06:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a6127b95faf2dc140b98a4fbc19cb072 SHA-1: 3ceaf829e68158dac8274afc761526e58ca92607 SHA-256: 2bd92a809a06c8682c00ae846b361fbe989f719e4110aa929e658982d59a8bb2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, with 'https://infrive.ru/pbw?utm_term=rocket+league+daily+tournament+times' being a prominent example that appears to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, contains keywords related to tournament times, likely a lure to entice clicks on the malicious links.

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://infrive.ru/pbw?utm_term=rocket+league+daily+tournament+times PDF link annotation
    • https://gupolapi.weebly.com/uploads/1/3/4/6/134629895/5fcc984a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465691/normal_60590c5399deb.pdfIn PDF document text
    • https://mojiwisixireze.weebly.com/uploads/1/3/4/6/134615440/nesesom_vitejin_gopovi_jufepopofupoviz.pdfIn PDF document text
    • https://rulodewarozuw.weebly.com/uploads/1/3/4/6/134678260/62236c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451561/normal_5fe717b06e67b.pdfIn PDF document text
    • https://rixagaxovexi.weebly.com/uploads/1/3/4/0/134000332/db8744fd161.pdfIn PDF document text
    • https://bomigisojibovo.weebly.com/uploads/1/3/0/9/130969974/5600159.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481275/normal_60159b731e4bc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kosumepifise.pbworks.com/f/xuvivivufetusebir.pdfIn PDF document text
    • http://todenulaw.pbworks.com/w/file/fetch/145057353/minecraft_offline_download_free_windows_10.pdfIn PDF document text
    • http://wisarazed.pbworks.com/f/perimeter_and_area_of_parallelograms_triangles_trapezoids.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd209a04-d6ae-4c7c-b671-b3e9a8578163/how_much_can_a_buck_weigh.pdfIn PDF document text
    • http://kizisoj.pbworks.com/f/active_and_passive_voice_of_imperative_sentences.pdfIn PDF document text
    • http://zokoralorif.pbworks.com/w/file/fetch/145282329/explain_the_five_vs_of_big_data.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87d0ffa6-b6dc-4a66-b446-b8bab6886105/gamev.pdfIn PDF document text
    • http://xijujik.pbworks.com/w/file/fetch/145279641/emergency_communication_plan_example.pdfIn PDF document text
    • http://vefubop.pbworks.com/w/file/fetch/144881157/baby_weight_chart_14_months.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_off0001dd83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DD83 5432 bytes
SHA-256: 6ea925a5df6c193cef98e1adcdfd9c119c997fbb34f3233c70ef79c9c2e53ecc
font_01_sfnt_off0001effa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EFFA 11832 bytes
SHA-256: c2a03fe4414f5af233b7a480c1445db66fc3a58ba40494902ffd40486474050c

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