Malicious PDF — malware analysis report

Static analysis result for SHA-256 a377fbc684018810…

MALICIOUS

PDF

146.0 KB Created: 2021-05-31 02:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 81da28510f2d1ac6a7ad469443025189 SHA-1: adf182732ba6283970a8e2a2cb89998eb58b30a3 SHA-256: a377fbc684018810af68ed1dab2da5b05d8e59048d023b3c58561d9ef38697c3
226 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous external links pointing to other PDF documents hosted on various disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to distribute further malware or engage in phishing. The presence of a 'Password-protected archive handoff' heuristic suggests a common tactic to bypass security scanning by encrypting the actual payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://nipisod.ru/123?utm_term=3dsky+beds+vol.+2+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4493890/normal_6027bbdf20d67.pdfIn PDF document text
    • https://putebofodabisig.weebly.com/uploads/1/3/4/3/134368176/1603425.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365653/normal_6024452abb58b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427514/normal_601c71ee1b559.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500677/normal_6048500a7dd7e.pdfIn PDF document text
    • https://ximavubakalik.weebly.com/uploads/1/3/0/7/130776508/nikawaronu.pdfIn PDF document text
    • https://mabaxezo.weebly.com/uploads/1/3/4/7/134766945/9272615.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424951/normal_60694de0d3cbd.pdfIn PDF document text
    • https://kilavolofijon.weebly.com/uploads/1/3/1/1/131164174/tejajutuzojozeja.pdfIn PDF document text
    • https://jagusidenoz.weebly.com/uploads/1/3/4/9/134902343/mibafute.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420431/normal_601e6c22100fd.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4412891/normal_60b2597792db2.pdfIn PDF document text
    • https://keridamanitev.weebly.com/uploads/1/3/5/3/135326745/863619.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380084/normal_5fcaf5e199fbc.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/da842598-276b-40c9-8ee6-b1460699ac0d/57772075968.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bedc036-b63d-438f-9e1f-d9adf451f97b/wewulepelenutuwalenudape.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83ccf275-a269-4ff7-9cb6-8de09a1d5bd8/bitlocker_recovery_password_viewer_tool_server_2012_r2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39a8ebae-6e4e-434d-b025-58714c30e20a/72547796707.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28de37a1-8707-48e6-bec7-f467c7dedefb/nidinefabejojezofufi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd804f24-2472-47cd-90e3-6fea69215620/fezesafididix.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off000206cc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x206CC 28176 bytes
SHA-256: 4acbd0d1b611324e5c15994e67173a06ebb50660a6746fec9b8822b176d17112
font_00_sfnt_off000103d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D4 67440 bytes
SHA-256: bf1dfa00798e6a7662a822381872ee2686853fe61c35ae3340d2604a02d9955f
font_01_sfnt_off0001cda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CDA6 5328 bytes
SHA-256: e25612743ef2a3027a983e5643de3d1a9731b3e5017485088701648a88e4f5de
font_02_sfnt_off0001dfe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DFE8 12000 bytes
SHA-256: 12a2f1b059463f037a47e1c195172ca3a3bb84d2e7f3e82f48cdd0b5a5f80387

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