Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aaab8975abd26f7…

MALICIOUS

PDF

88.9 KB Created: 2021-02-18 14:50:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: a424ee73c76e358f3aa01c72ad5c15bc SHA-1: e3a22cab1895bb38bd028a3decbc04d53ab2b0f3 SHA-256: 4aaab8975abd26f7eed45545c1199df307b8e4ea319de5735133e657753a1c69
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to exploit users by presenting a deceptive interface, possibly leading to the download of unwanted applications or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://druttle.ru/wix?keyword=keepvid+apk+for+android+2.3.6 PDF link annotation
    • https://cdn.sqhk.co/difixoruze/pajbheM/new_york_times_crossword_puzzle_book_large_print.pdfIn PDF document text
    • https://cdn.sqhk.co/baruduwege/ggFiijg/20737634445.pdfIn PDF document text
    • https://cdn.sqhk.co/zukuxenopo/didA2ia/20228926179.pdfIn PDF document text
    • https://cdn.sqhk.co/jomonufo/cijZjbe/god_of_stickman_3_hack_apk_2019.pdfIn PDF document text
    • http://startbastar.online/nuvusudubafef91q23.pdfIn PDF document text
    • https://riregagofowa.weebly.com/uploads/1/3/1/3/131379776/gutakoz_merobalizuxupu_pinalaju_pexezotuzez.pdfIn PDF document text
    • https://dipakexamima.weebly.com/uploads/1/3/1/0/131069759/wilokuropatikijatowi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470828/normal_60021d64db43c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391009/normal_600aa96baac27.pdfIn PDF document text
    • https://cdn.sqhk.co/dosojegomugu/JjcJ3qA/dadutopadagipuvudoravi.pdfIn PDF document text
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/xazumosakavo.pdfIn PDF document text
    • https://cdn.sqhk.co/ferobisuw/hjXFHG5/narezepaxewowoko.pdfIn PDF document text
    • https://fedalovojuxunod.weebly.com/uploads/1/3/0/7/130775560/1924934.pdfIn PDF document text
    • https://mavuweginu.weebly.com/uploads/1/3/2/6/132681431/jimuvuj-jilereduxewi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466368/normal_6020448a35a5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450145/normal_600fed8e81e48.pdfIn PDF document text
    • https://mokomowu.weebly.com/uploads/1/3/5/9/135969792/7992717.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407102/normal_5fdddc94528aa.pdfIn PDF document text
    • https://pelosewedi.weebly.com/uploads/1/3/4/7/134753512/velar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF881 12760 bytes
SHA-256: 27dcadb2aad0e43ae108b0dfd7fc69ba5df543ab86a2574803dc7f76434fa91d
font_01_sfnt_off0001200c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200C 5400 bytes
SHA-256: ce6e1c58c7cf8672dd7b6507a7cfc242963561c4edec516544214f5a374f9eb7
font_02_sfnt_off00013289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13289 10196 bytes
SHA-256: 1db64fc5b492282f63559775440e146d31ca446412e555482c5fd0b425f990ff