Malicious PDF — malware analysis report

Static analysis result for SHA-256 92d7ef9e1be1e641…

MALICIOUS

PDF

84.7 KB Created: 2021-04-23 18:14:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7472e454fc921c7442605714d6783e96 SHA-1: 6a7ebc2031cef63c3167cb18e89ac6d135e80417 SHA-256: 92d7ef9e1be1e641e0f3dc069eb75f02018b4f188dc7b592444394fe49175cca
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, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to redirect users to malicious sites, likely for malware distribution or credential harvesting.

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://vilenefex.ru/strik?utm_term=the+5+love+languages+test+free PDF link annotation
    • http://veselutut.mywebcommunity.org/xudobijulojuja.pdfIn PDF document text
    • https://nurinakeviwiket.weebly.com/uploads/1/3/1/4/131407921/potabumaleb.pdfIn PDF document text
    • http://optarfes.com/187872713984nqmx.pdfIn PDF document text
    • http://bupro.asia/how_to_express_happy_feelings_in_words2vtkx.pdfIn PDF document text
    • http://rowewuxeg.getenjoyment.net/caquexia_neoplasica.pdfIn PDF document text
    • http://bagutoruramig.mywebcommunity.org/adobe_flash_2d_animation_tutorial.pdfIn PDF document text
    • http://favodokoleti.mypressonline.com/ravubefip.pdfIn PDF document text
    • http://amsidgi.xyz/how_to_start_a_stihl_weed_eater_fs_9016tpc.pdfIn PDF document text
    • http://pusovemolexed.scienceontheweb.net/32877653056.pdfIn PDF document text
    • https://nojoxarojip.weebly.com/uploads/1/3/0/8/130813855/fce8512013.pdfIn PDF document text
    • https://pigukoziluluz.weebly.com/uploads/1/3/4/8/134896600/xewexuja.pdfIn PDF document text
    • https://jubibololir.weebly.com/uploads/1/3/2/8/132814038/61333094a28e46f.pdfIn PDF document text
    • http://pristav.pro/free_games_dx_ball_5frlsg.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/d4abc4bb-e280-4e3c-87d3-4fe40c495a9d/sanurijegudep.pdfIn PDF document text
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_4ac8d679dc994bec8f43e0ac99661aac.pdf?index=trueIn PDF document text
    • https://f904ef53-caa1-4f0f-8a97-c50675c03ece.filesusr.com/ugd/2f8cea_614d23ab4aa443d3be2a2c188ddb5e85.pdf?index=trueIn PDF document text
    • https://f1c0478e-57b3-422a-b8eb-433964b677d2.filesusr.com/ugd/16c17d_09a07b0c13f24bbeaf2d7d7a32efe284.pdf?index=trueIn PDF document text
    • https://dbba0f06-1911-40f0-8c80-a2638c7f81cc.filesusr.com/ugd/b13fd1_4aa646321e054f8fbc8e0a041f6422e9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/822ee4e7-19d0-403d-b258-08429337533d/munuramasapikega.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_off00010e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8F 5160 bytes
SHA-256: 6f60db756e56701538c2a6e3c6f0a0d4f00b5185fc6f2f889999d6c98cfe5364
font_01_sfnt_off00012027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12027 11104 bytes
SHA-256: f879083e34fe6d25f5980f6dd0c3dd258fda07c294cf2e3b740701b213e0f6cd

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