Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0f26f1d515a3aa8…

MALICIOUS

PDF

84.3 KB Created: 2021-03-13 22:07:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 990c674548a222edbb45380cf6e4a79c SHA-1: d5160174904b4117c597287f8545f4809be73729 SHA-256: d0f26f1d515a3aa8055220cc58fe0a92bfc61407eadd8bfe89a996b3b58529a8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or SEO spam operation. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the structure suggest an attempt to redirect users to malicious or spam content.

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
  • 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://soxebez.ru/wix?keyword=pes+2020+oceanofgames PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485001/normal_603ab1569a835.pdfIn PDF document text
    • https://rigugoxa.weebly.com/uploads/1/3/0/7/130776225/rejugogabemawogix.pdfIn PDF document text
    • https://towizitubozabo.weebly.com/uploads/1/3/5/4/135400713/34ea9b5b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486963/normal_6035a2170ef9d.pdfIn PDF document text
    • https://vulopinuvi.weebly.com/uploads/1/3/1/1/131164419/60ba31c86e3ff1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407331/normal_604412d4c270c.pdfIn PDF document text
    • http://tabikola.online/nicholas_sparks_novels84eyy.pdfIn PDF document text
    • http://bestita.space/tizogixovuno0vg5g.pdfIn PDF document text
    • http://poverkavoda.website/kakatugidekuvo763d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369519/normal_603b904b7936c.pdfIn PDF document text
    • http://idem-peshkom.ru/data_structures_and_algorithms_in_swiftvpa1w.pdfIn PDF document text
    • http://souve.me/is_there_a_reset_button_on_freezersg4fbk.pdfIn PDF document text
    • https://xuzomavarek.weebly.com/uploads/1/3/1/3/131383242/0a1b8.pdfIn PDF document text
    • https://tixoguwod.weebly.com/uploads/1/3/4/6/134694164/punorumabuworaruv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b564fea6-732e-489f-a029-a72dc6590de2.filesusr.com/ugd/6a4619_272387da29f74136abe4d253eedf4864.pdf?index=trueIn PDF document text
    • https://6ce95562-7558-49ee-a7b0-b3003db3b0e9.filesusr.com/ugd/d13e1f_f8769bc85b734e6abd0c67708202ca9c.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_off00010ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA7 5348 bytes
SHA-256: 5342638284bdcfe1310e8b049dfb9a2da5784d3fae7b61148789a058fb584f48
font_01_sfnt_off000120d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D9 10396 bytes
SHA-256: c5706e12af15608b403aa6f91fe46b6c9478a520e7a3ee21b39a9c71c7053441

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