Malicious PDF — malware analysis report

Static analysis result for SHA-256 add48a71eb800515…

MALICIOUS

PDF

73.8 KB Created: 2021-03-16 09:57:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 704be821250ff879ed60479c33615f9b SHA-1: 1eb8e42f09fb6a1396fc4bfa57e8228e193f5c21 SHA-256: add48a71eb8005159172398088fc578afbb8b79983619b524e64816a8970ff65
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and potentially phishing-related. It contains a large number of external links, suggesting it is part of a link farm designed to drive traffic to malicious sites. The primary malicious URL identified is https://dafemum.ru/strik, which is likely used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/strik?utm_term=yoga+poses+for+weight+loss+and+toning
    • https://cdn-cms.f-static.net/uploads/4455208/normal_60121843232eb.pdf
    • https://cdn-cms.f-static.net/uploads/4369310/normal_5fe66018d08fe.pdf
    • https://xososikanezav.weebly.com/uploads/1/3/4/8/134892973/puxepeperuramul_wixegat.pdf
    • https://lezekuzog.weebly.com/uploads/1/3/1/3/131378913/dajopu_dekavive.pdf
    • https://cdn.sqhk.co/nugilatunu/eicjcgd/19657318429.pdf
    • https://cdn.sqhk.co/ritasuxa/hpGhjhc/best_online_art_masters_programs.pdf
    • https://bopidojosonek.weebly.com/uploads/1/3/1/3/131384153/jasakamax.pdf
    • https://setabuzi.weebly.com/uploads/1/3/0/7/130775645/37ce276e112a.pdf
    • https://cdn-cms.f-static.net/uploads/4460060/normal_601fcb473211c.pdf
    • https://cdn.sqhk.co/mizogujuzo/iggd3Xq/us_passport_renewal_application_form_for_child.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vuliwisuwig/57648273171.pdf
    • https://s3.amazonaws.com/vososasoxumete/wozokemuvezumonagi.pdf
    • https://uploads.strikinglycdn.com/files/7c697a93-5748-4ae7-8640-acc57119dd3b/ridizebominironol.pdf
    • https://s3.amazonaws.com/wupagivoz/anarchism_in_latin_america.pdf
    • https://s3.amazonaws.com/vojapu/is_the_herald_sun_printed_today.pdf
    • https://s3.amazonaws.com/wovitiku/rote_counting_1_20_worksheets.pdf
    • https://s3.amazonaws.com/sorogamat/26584609674.pdf
    • https://s3.amazonaws.com/sugowubuf/alexandre_de_moraes_direito_constitucional.pdf
    • https://uploads.strikinglycdn.com/files/7cefa943-25f9-43d4-baa7-0629f235f748/dujedusem.pdf
    • https://uploads.strikinglycdn.com/files/fe990871-065b-47c8-a011-6753c00b1831/apple_airport_express_instructions.pdf
    • https://s3.amazonaws.com/tipikaxe/attachment_report_example.pdf
    • https://uploads.strikinglycdn.com/files/328d1102-e4ba-409e-b754-f28840921eb6/49022770468.pdf
    • https://s3.amazonaws.com/somamere/damubazijip.pdf
    • https://s3.amazonaws.com/wulagisi/18614433067.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e366.bin
5fa3cae3b53748b93a2378ede66868762a46e675c22bf67365f30b39987eaa76
pdf-font-stream PDF embedded font (sfnt) at offset 0xE366 5356 bytes
font_01_sfnt_off0000f5ac.bin
2caf6db46f9d909e4a0908d9619fbd9de0e3c0027c22c1b1a81764b5b16bb4d5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AC 10600 bytes