Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd18dcedb9c1f73…

MALICIOUS

PDF

72.2 KB Created: 2021-03-16 12:49:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 70c4447e09f26b348d55db8e62dd6e82 SHA-1: d538b46d2ae1589faa3170fc10e44d5ac4e3bae9 SHA-256: efd18dcedb9c1f732d49b691737bb780796e2223dfe9f21221b1514bebe4fe58
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to other PDF files, suggesting a link farm or redirection mechanism. The primary URL, 'https://jumiwimov.ru/wix?keyword=tank+trouble+deathmatch+unblocked+games', is presented as a game, likely a lure to disguise malicious intent. ClamAV detection and ML classification strongly indicate maliciousness, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/wix?keyword=tank+trouble+deathmatch+unblocked+games
    • https://cdn-cms.f-static.net/uploads/4461786/normal_5fd1997511778.pdf
    • https://cdn.sqhk.co/jegisizozul/gjBjggj/nupudagonodemexezes.pdf
    • http://pedaxofanor.mywebcommunity.org/rozomajirodesexo.pdf
    • https://najafisexu.weebly.com/uploads/1/3/5/3/135330693/cfdccba23d80.pdf
    • https://cdn.sqhk.co/baluwofuk/LPSjckU/88604790940.pdf
    • https://cdn-cms.f-static.net/uploads/4478655/normal_60226d6333fc8.pdf
    • https://zevofukuje.weebly.com/uploads/1/3/4/5/134585027/6233253.pdf
    • https://cdn.sqhk.co/xidupesijij/Mhhjiij/nabijubesawugakowebezipuz.pdf
    • http://gapagal.mywebcommunity.org/the_i_o______allocates_the_devices_control_units_and_channels.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7ae78dbb-624d-4045-820d-31adbfed707d/73401543014.pdf
    • https://uploads.strikinglycdn.com/files/beea43e4-803b-4d0a-80cc-70e2da6d3809/mibareguzorolap.pdf
    • https://s3.amazonaws.com/sorogamat/85466576587.pdf
    • https://uploads.strikinglycdn.com/files/652fab24-bfc7-47e6-be09-525940b6be10/firekemowuk.pdf
    • https://uploads.strikinglycdn.com/files/f63ff6f0-370d-4f5b-8510-2a61fd0794c9/kuwozuvozido.pdf
    • https://s3.amazonaws.com/dutuzanob/41330502217.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_off0000de86.bin
2656c01c9e5b81732ab787cf6a3053c6a3396b98ec0b7be9fd4354a9d1f42c02
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE86 5504 bytes
font_01_sfnt_off0000f111.bin
5d08aee914b86dd07c00ff5c2b868356f5e47dcb6e31112e04c15148fe5eb6d2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF111 10284 bytes