Malicious PDF — malware analysis report

Static analysis result for SHA-256 d77bb970cfcaab59…

MALICIOUS

PDF

73.6 KB Created: 2021-04-29 18:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 853d8fca2171271b1b923c7f30b36804 SHA-1: 462019bb925f2e76433ce8572f4393bcc7ae945c SHA-256: d77bb970cfcaab59236bd4fd9548cd79016a8b78019ef81d210de207263b81ec
184 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or SEO abuse. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8120

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 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
  • 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://jacksth.ru/strik?utm_term=baby+girl+names+start+with+kee PDF link annotation
    • https://cdn.sqhk.co/detobero/idjhwhi/botodobonitemurofopuxapi.pdfIn PDF document text
    • http://xepuxupipe.mywebcommunity.org/duwenipunokonag.pdfIn PDF document text
    • https://vaxevadokipab.weebly.com/uploads/1/3/4/6/134610393/8061933.pdfIn PDF document text
    • https://cdn.sqhk.co/wejawujagi/wiiyjeB/rustic_white_night_tables.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/eiigeji/vifupenivufozabaferotagib.pdfIn PDF document text
    • http://pinopizo.sportsontheweb.net/zowapaxonomemidudunu.pdfIn PDF document text
    • https://xatomurukazaj.weebly.com/uploads/1/3/4/3/134378662/4266949.pdfIn PDF document text
    • http://fanisore.sportsontheweb.net/wegugiriwomijejawuninu.pdfIn PDF document text
    • https://bituxusod.weebly.com/uploads/1/3/4/3/134347303/zofuwaged.pdfIn PDF document text
    • https://xaroduzorosu.weebly.com/uploads/1/3/1/3/131398324/ruped-gobitaronobe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jujojomojemiz/crack_autodwg_to_dwg_converter_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd2b702f-0c00-4731-b73d-41a72adadc7a/74045331433.pdfIn PDF document text
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_7e4c8122a1ee4718b956c0d8d9575167.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/da6b999e-edb8-4636-a315-556ce789c5de/how_to_study_physics_fast.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/conjunction_and_but_or_worksheet.pdfIn PDF document text
    • https://44f68060-d5e3-4d58-b4e7-e3760392f352.filesusr.com/ugd/49488e_0bddda24d5d5410fb87d49d92ad23ce2.pdf?index=trueIn PDF document text
    • https://13ea8442-998f-4f14-ba3b-7f37e53a414c.filesusr.com/ugd/008a9f_0aa1896d509d485f91343585c45b6cf1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/superannuation_guarantee_act_1992.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/gexofamixuxiwu.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/mesasa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27b0a836-e02b-490a-96a2-98a4330b260d/72138041364.pdfIn PDF document text
    • https://c538924d-9290-4e35-808b-5013ecaac822.filesusr.com/ugd/047ea9_93bc8d8ae8c347278faaf1ed64400ac3.pdf?index=trueIn PDF document text
    • https://3926d074-74ab-41cc-aa9d-340192ccda4e.filesusr.com/ugd/5619e7_44d9af27ff6945ddaa943ff25850305c.pdf?index=trueIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10443 5224 bytes
SHA-256: 9c699c2b4a7358c52e9ae69c743787563ff1784c098805e11f3071c66630a78d

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