Malicious PDF — malware analysis report

Static analysis result for SHA-256 25222106e1eea8aa…

MALICIOUS

PDF

86.4 KB Created: 2021-03-24 12:45:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: eef737b27f58524f3fa5d3d866b705c3 SHA-1: 92130fa62f096f0fb43053056766137582433c1c SHA-256: 25222106e1eea8aaab501c466a41f09877a2baf432b8e7a8bfa71f6fe90c00c4
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URIs pointing to various domains, likely for SEO manipulation or to host phishing content. The presence of multiple disposable hosting domains and a high number of links per host further supports this assessment.

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://leonvi.ru/wix?keyword=bink+video+player PDF link annotation
    • https://xisofapetuv.weebly.com/uploads/1/3/4/7/134747578/gesuwusekidedaz.pdfIn PDF document text
    • http://livemavuxedu.getenjoyment.net/a_user_s_guide_to_network_analysis_in_r.pdfIn PDF document text
    • https://labifunuvi.weebly.com/uploads/1/3/4/8/134847398/be9827.pdfIn PDF document text
    • https://cdn.sqhk.co/dasotipamu/g1gd4ig/rudra_cartoon_show.pdfIn PDF document text
    • https://lanasasaf.weebly.com/uploads/1/3/0/8/130815311/6291346.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwefuxab/gjH9Sib/masterminds_game_show.pdfIn PDF document text
    • https://cdn.sqhk.co/gowamojon/fzifMGj/78588198898.pdfIn PDF document text
    • https://cdn.sqhk.co/lebexuzo/hsvhjha/wilokozusedazokavoz.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/ea442bf1-dc83-4eb0-88aa-6eeb9214e911/you_should_meaning_in_telugu.pdfIn PDF document text
    • https://1ba6f066-89d4-4445-b8a9-08a6de046ef2.filesusr.com/ugd/d40554_17bf2cc447fb408b83f12dcb98075383.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/75d37f1b-7ed2-4cb6-a04b-dc91b0b2811a/nuwejaju.pdfIn PDF document text
    • http://tibutariwu.myartsonline.com/29090490675.pdfIn PDF document text
    • https://s3.amazonaws.com/nefagolom/92019668544.pdfIn PDF document text
    • https://104e0e48-a4c2-4a03-8647-06ef64d4e6ac.filesusr.com/ugd/e2c6c1_4a4885ce1e2045b98ee35a4a06e95b98.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/putetebozu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2db36c2e-27fe-438e-8d62-0ec8083f86dc/macbeth_full_movie_youtube.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/42979755220.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd48b6c2-7f84-4a4c-96eb-e56d443c802e/91672627121.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_off00011566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11566 5052 bytes
SHA-256: 128649121cbb93b1b95844c8ea4dadbdd77055700a57d0e76c9047247a73accd
font_01_sfnt_off000126b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B7 11212 bytes
SHA-256: d10211b72c0f01e4f1c4f644f6e538ed6838a03a90c82533689481622aed1b29

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