Malicious PDF — malware analysis report

Static analysis result for SHA-256 8254b93f0bffba3b…

MALICIOUS

PDF

69.9 KB Created: 2021-02-17 22:39:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: aef325a00c2d4bf80e41aa1bf1648270 SHA-1: 5754086e7c164e153a147eafcb72638035718bfe SHA-256: 8254b93f0bffba3be24119c046612449ca7574623c9252289f7290ba1eeaa06b
126 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it is a link farm hosted on disposable domains, designed to redirect users to external URLs. One prominent URL, 'https://bologen.ru/strik?utm_term=why+is+the+blue+light+on+my+netgear+router+flashing', suggests a lure related to network device troubleshooting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://bologen.ru/strik?utm_term=why+is+the+blue+light+on+my+netgear+router+flashing PDF link annotation
    • https://xogoluxoso.weebly.com/uploads/1/3/4/4/134444279/tupatigemunepis-lumutib-relakabawuruse.pdfIn PDF document text
    • https://cdn.sqhk.co/tuledapozato/jazicgi/movie_scenes_to_recreate_with_friends.pdfIn PDF document text
    • https://cdn.sqhk.co/xudevekelefe/NohhCng/sowizezazuxotebufojo.pdfIn PDF document text
    • https://cdn.sqhk.co/modonasuje/fLfhchi/39345126177.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405903/normal_5fe78fdd9d627.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452382/normal_5fedfafbdb928.pdfIn PDF document text
    • https://zazanopub.weebly.com/uploads/1/3/2/7/132712119/mewenofigexusupo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450353/normal_5fdb9d318cd6c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366389/normal_5fe3d5ba8d51e.pdfIn PDF document text
    • https://naxulukituno.weebly.com/uploads/1/3/4/8/134879135/sawugolerexuvu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365662/normal_5fe4eedc07ae0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409395/normal_5fe99905e295c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456165/normal_601f2066d83bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486984/normal_5ff926e809967.pdfIn PDF document text
    • https://tunuzari.weebly.com/uploads/1/3/4/3/134316111/7a437391.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/timituvupame/all_tools_apk_pure.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/96758448654.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/hunter_x_core_irrigation_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/taxugoraguduvuxesi.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_off0000d471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD471 5436 bytes
SHA-256: a578a7f0afb18b814bb7a6ce5468b49a6d5577dbeb044b92d3011a8b79d9a446
font_01_sfnt_off0000e6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DA 10284 bytes
SHA-256: ea36b8971a58695f08abbae80b59a81a5d5964156d3d40b204f9679c96a9e338

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