Malicious PDF — malware analysis report

Static analysis result for SHA-256 083a441a82518d30…

MALICIOUS

PDF

112.0 KB Created: 2021-03-11 06:26:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 040aaf12d53c06787819b1583873b999 SHA-1: 56db85955bc4e847eee3629205745880271043d1 SHA-256: 083a441a82518d30c721c0d0c4fbe106345f572c9ad064d6e2c22d098717f1a2
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/award?keyword=armenians+in+lebanon+pdf PDF link annotation
    • https://vuminuzatadabem.weebly.com/uploads/1/3/4/3/134311796/bisoxiwoliku_jileb.pdfIn PDF document text
    • https://nonafinawajag.weebly.com/uploads/1/3/4/3/134331790/3698985.pdfIn PDF document text
    • https://saletenabij.weebly.com/uploads/1/3/4/3/134339554/617994979.pdfIn PDF document text
    • https://nidewusojob.weebly.com/uploads/1/3/1/4/131438556/6031959.pdfIn PDF document text
    • http://begemotiks.fun/soul_calibur_full_gamey7plh.pdfIn PDF document text
    • http://fallofelin.online/morupajizofedomogem0sxv.pdfIn PDF document text
    • http://copyrightsafetyhelps.com/remulipv1igv.pdfIn PDF document text
    • http://silewugebed.scienceontheweb.net/wasujiriroxaxeluzosix.pdfIn PDF document text
    • http://sozimaxetupow.mywebcommunity.org/how_much_does_it_cost_to_bulletproof_a_6.0_ford_diesel.pdfIn PDF document text
    • https://faxojoduso.weebly.com/uploads/1/3/5/3/135351685/6cb53cbe34a7.pdfIn PDF document text
    • http://kukushpa.fun/rowinapebomezazi9qvgl.pdfIn PDF document text
    • https://tagasudinabasow.weebly.com/uploads/1/3/5/3/135325797/zesaki.pdfIn PDF document text
    • http://merishwheelrecords.com/108786883297sk4d.pdfIn PDF document text
    • http://fotubobuwenapu.scienceontheweb.net/how_to_update_nexus_10_manually.pdfIn PDF document text
    • https://gifolavetufo.weebly.com/uploads/1/3/2/6/132695571/0e241af65ff.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f8d4b294-f952-4a11-85e8-0a3036f9bdaf.filesusr.com/ugd/ad8f3a_7d9dda8e30954870aad583e637b10df2.pdf?index=trueIn PDF document text
    • https://d2faa26e-66ca-44cd-8f84-883624a71019.filesusr.com/ugd/dbbfd0_75c2bce36faa4821b998a3abc96f507b.pdf?index=trueIn PDF document text
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_54f8ac27889a4817a07694912e529326.pdf?index=trueIn PDF document text
    • http://jupevesu.atwebpages.com/zaxanoke.pdfIn PDF document text
    • https://5b2b9875-3923-4577-9ef6-0527498c95e7.filesusr.com/ugd/4e6dd5_fe3c18e22b004e3aa936e1b9cdbf3f82.pdf?index=trueIn PDF document text
    • https://0fc0baf9-b884-4fcd-968e-f93c0f938930.filesusr.com/ugd/68ec51_cc88acd139e043909a5407681ee1a3a7.pdf?index=trueIn PDF document text
    • http://kexomun.myartsonline.com/belden_cat6a.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14186 5316 bytes
SHA-256: c2034a01ddf71e7f6b2c01195ccc2ed04b642d55ec420b7756097b2845097219
font_01_sfnt_off00015374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15374 13852 bytes
SHA-256: 2c63a93b14408e9abb81d195f19ebb49018835152c0f854e43ec13ee98515faf
font_02_sfnt_off00017f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F5B 25536 bytes
SHA-256: b914bb040b7634f3ac835144a65906c7fcccf3b6642e2e50b018c087b1df835b