Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e0c8d1af081bb1c…

MALICIOUS

PDF

80.6 KB Created: 2021-03-01 15:14:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 814fa3c6b6a652aa4aba23693078ac21 SHA-1: fdc528bf2ea134c8659f0abad56370aa6fe41fcd SHA-256: 5e0c8d1af081bb1cd414bab46c51bf6a62cbfce1bd80a59f55af2197ed273b2a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful content.

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://zajinet.ru/strik?utm_term=what+is+the+difference+between+single+phase+and+three+phase+inverter PDF link annotation
    • http://olymp-trade.top/xomusewazametopisozafuke7bm6i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454822/normal_602e2ea8966fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371505/normal_5fe7bd6104b10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406168/normal_5ff3503599a29.pdfIn PDF document text
    • http://rasudilikid.mywebcommunity.org/18894283553.pdfIn PDF document text
    • http://mumolazesinidix.getenjoyment.net/nutrition_care_process_pes_statements_examples.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409604/normal_60274877d2d74.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428045/normal_5ffca24b48e09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480173/normal_602957a789f4a.pdfIn PDF document text
    • http://setofexperience.site/694502791509lgf0.pdfIn PDF document text
    • http://wersita.fun/nonprofit_business_plan_example_ukov31y.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://mudivufovibu.epizy.com/xikunoki.pdfIn PDF document text
    • http://gajulofuva.epizy.com/gaxemikupozelakevolu.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/93148703688.pdfIn PDF document text
    • http://lekodabiwizu.epizy.com/6563496926.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/79751159367.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/bronkitis_akut_dan_kronis.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA6 5400 bytes
SHA-256: f642bee594bdac6544ac906c19cac193dc387bb97364be0e3eb4365c317937cb
font_01_sfnt_off00010211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10211 10724 bytes
SHA-256: a25de1e27c81d92853361950b6f5ec6050acdbd522a6681b2175883ea32b59da
font_02_sfnt_off00012677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12677 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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