Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d5e6e6d59fcb34…

MALICIOUS

PDF

96.8 KB Created: 2020-12-18 20:25:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d0849ad564f5c8a145fcb0cb2a87667 SHA-1: 4eede547ea12d2166f89d664e35ae32927cff403 SHA-256: 91d5e6e6d59fcb34fceb45759e5dc3847d2c9f661ffd6637afce6450ed628455
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, suggesting it functions as a link farm, potentially for SEO manipulation or to distribute further malware. While no scripts were explicitly extracted, the presence of numerous external URLs points towards a phishing or content distribution attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafficel.ru/strik?utm_term=life+note+death+note
    • https://zorusijumabek.weebly.com/uploads/1/3/4/8/134851431/1242662.pdf
    • https://fadefewili.weebly.com/uploads/1/3/4/3/134316521/kanawavafijenu-javizepide-timixiliwob.pdf
    • https://static.s123-cdn-static.com/uploads/4446643/normal_5fc809a96e26f.pdf
    • https://cdn-cms.f-static.net/uploads/4369776/normal_5fb283a51329b.pdf
    • https://donikigegetala.weebly.com/uploads/1/3/4/3/134311768/fudazujawaledo.pdf
    • https://dobopekajami.weebly.com/uploads/1/3/4/3/134314215/603053.pdf
    • https://xisuviwilizej.weebly.com/uploads/1/3/4/3/134320176/4e9e25.pdf
    • https://duzetokip.weebly.com/uploads/1/3/4/4/134404829/zebizusefagidekulaja.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rudelazifizuvo/40828999790.pdf
    • https://uploads.strikinglycdn.com/files/1c3cd30f-4fb1-4e03-afcc-f09728c0cfaa/12010555694.pdf
    • https://s3.amazonaws.com/sugosubexez/bvg_online_application_form.pdf
    • https://s3.amazonaws.com/xomudufe/42427871221.pdf
    • https://s3.amazonaws.com/pojojagajevuxa/life_after_apkpure.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116a7.bin
99a9cb80e9045b6aa8f3ac3e30c5969101dcb66f988c29534affb165699699de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116A7 4516 bytes
font_01_sfnt_off0001266c.bin
67f841228997bf68b7bde794f858e2cce0eccdb9cfeea405cdc572c8493efb05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1266C 4632 bytes
font_02_sfnt_off00013631.bin
fca0ac393937a7efc51a676ad281de2b746a1a0904269a08bd63e8e12992235d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13631 14872 bytes
font_03_sfnt_off00016096.bin
0ddbdf075a6b93c30840c956f82c28930afd570615945c5f10d387cf6e2c8926		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16096 16164 bytes

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