Malicious PDF — malware analysis report

Static analysis result for SHA-256 09deb8797a35b484…

MALICIOUS

PDF

77.8 KB Created: 2021-03-07 14:15:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 53d17e0d52c72d7b0eeefc3c67a1348e SHA-1: 97fbc7f552d500b6d08f1454f880bcccf4317920 SHA-256: 09deb8797a35b484486be930bd13c173f88bae2ceec08f858ae5c4e3682f5d47
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/wix?keyword=v8+muscle+cars+for+sale PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452392/normal_5fd5f59f28dae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460963/normal_601de5a124efd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447641/normal_5fe2972fc96c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392661/normal_604343e035373.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c18d7360-3707-4bf1-9d6f-52ba7510fa17.filesusr.com/ugd/76cb06_491f9be280e84d9d94d79ef68fb8ca96.pdf?index=trueIn PDF document text
    • https://8533cbf3-c0d6-400c-bdf8-8ca38cf0242b.filesusr.com/ugd/135178_64d0e6266ab64f9f84f573ca24b06f7e.pdf?index=trueIn PDF document text
    • https://be934b08-0dcc-4e2e-8de1-c3c1c32dbfab.filesusr.com/ugd/d5415a_4da5da0a74ba46869d0e588abde78a2c.pdf?index=trueIn PDF document text
    • https://03f57db0-fbcf-46ec-8713-21b5992b8512.filesusr.com/ugd/455f95_0b45bd05974f4239adff953dbaa931ca.pdf?index=trueIn PDF document text
    • https://f61a8d15-835b-4c36-a3db-e4ead73ab13f.filesusr.com/ugd/e9f5f3_d921ee35424849aa86edd574debdc03c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee1ce437-aff6-4c07-b504-b095dd461074/gadisomixi.pdfIn PDF document text
    • https://28932ed2-21d9-4123-99cb-fcff0aac4472.filesusr.com/ugd/cc089a_8cfc0c7935294938866db75e11c1e5d0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9803725b-b650-4304-8dbd-64473f66ced0/cobra_148_gtl_dx_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4d9060d-f8f3-48a7-9977-27814b7e1c4d/jotirowuzedugovipetal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa06be87-1b3d-4ff1-961c-a8581da0ecc9/kuxugigibizogonulabegeti.pdfIn PDF document text
    • https://9a4203bb-6ff2-4ef1-9c63-3f113f84a884.filesusr.com/ugd/ea9bdf_6d6eb6919bd64330a92295a75842afca.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcbe03eb-58f8-4104-9cd7-9b6e137cdb33/takuminelozazijivewigu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/897f2638-bddf-4d56-9884-fea61bd85d5c/craftsman_table_saw_fence.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2811aea-86c9-4c98-8935-a948a461bb4e/73330640820.pdfIn PDF document text
    • https://ca7c05ed-d233-4774-9cf9-08ff86aa6c73.filesusr.com/ugd/b42fd6_73b0e4ef5883462c9aef73fd88c84d7d.pdf?index=trueIn PDF document text
    • https://19508648-7f28-415f-8121-b57715dc1465.filesusr.com/ugd/9734e7_349ae8f25e174e52ae279783745be5e3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/727fa713-53d1-4275-b0f6-356eea92dbb2/swiffer_wetjet_floor_cleaner_solution.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acd032d0-8969-49b8-be77-ae5b16097a07/20125215902.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2068474b-91ff-4d2c-a82e-b0063a5b01de/dutitesezilozitebexeboped.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_off0000f51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51F 5188 bytes
SHA-256: 9be1c94cac6d5bd0bbc3d4371889794568a6e9b1eeca3a8e9844c75bdfbaaf95
font_01_sfnt_off000106b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B1 10328 bytes
SHA-256: fa781606f6e33cf9671cd84656106d29be6fbacdcfc1d430441c778785b878aa