Malicious PDF — malware analysis report

Static analysis result for SHA-256 51ac2649eb1c75fa…

MALICIOUS

PDF

73.7 KB Created: 2021-05-31 02:23:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f45f765600628cdf2fcaedf3fdf37dec SHA-1: fadd9a70c845bffd233d9971906caf1896a4c51e SHA-256: 51ac2649eb1c75fa0d7e9d222b1cfb841014939ceec5d75bb2177f70298946b6
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting domains, suggesting a link farm or distribution mechanism. The embedded URL `https://dugedepap.ru/strik?utm_term=how+to+play+left+center+right+dice+game` is part of this farm, likely intended to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://dugedepap.ru/strik?utm_term=how+to+play+left+center+right+dice+game PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501484/normal_60345bc0c1623.pdfIn PDF document text
    • https://dapijapivabug.weebly.com/uploads/1/3/4/3/134338952/lezisebijazemibifip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387219/normal_60014f4abedd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451927/normal_606ade2da5d29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406771/normal_5fd2dd87a6aa2.pdfIn PDF document text
    • https://marizezibafive.weebly.com/uploads/1/3/4/8/134865590/3607838.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379961/normal_604caf6f35546.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4451929/normal_60b14084e8684.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426418/normal_6013867abd600.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385859/normal_604d262225c29.pdfIn PDF document text
    • https://zunaxufozasu.weebly.com/uploads/1/3/4/5/134500871/jaroref-fakepemevox-redutatedu-kubaderunusebid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502246/normal_5fced4d075615.pdfIn PDF document text
    • https://fotelosalif.weebly.com/uploads/1/3/4/4/134463398/gumet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410965/normal_6001be6108363.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/df52988b-942b-421a-af04-56229412b2e2/said_is_dead_anchor_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf7c0508-e97f-4be0-8e38-04311fad68fe/90166412978.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34bd44d1-e8db-4059-bc45-1204ef68d564/3_metros_sobre_el_cielo_wikipedia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9568478d-523f-46d5-8418-16ed4de80f6a/twilight_saga_movies_walmart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e723720b-aef5-426d-9ea1-fe74ba1cbff4/14783642572.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f45d5ab5-9314-4429-8f0d-45a640d48307/what_does_code_12_mean_on_a_rinnai_tankless_water_heater.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_off0000e283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE283 5548 bytes
SHA-256: 9a506867d0c3c03c91dbfc3c7afdb3411b1b6ef9ad33f75abf45143dbab634de
font_01_sfnt_off0000f54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54D 10584 bytes
SHA-256: 9117d46efc01bb9b5979efe716e95ac346445fdb4da1313597ce327b368f1cc2