Malicious PDF — malware analysis report

Static analysis result for SHA-256 cafa462efe1df1ff…

MALICIOUS

PDF

90.9 KB Created: 2021-05-14 12:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: df6c11bdd8afb97bf42d3e39d6158773 SHA-1: 9b3e9e4253b84018b2ec3ce9f9c216b293c37b3c SHA-256: cafa462efe1df1ff154a0590e661b3af9f95b956b51e19ceaa890cc1edd8488c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm designed for SEO manipulation, likely to host phishing pages or malware. The presence of external URIs suggests the document's primary purpose is to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://druttle.ru/strik?utm_term=starplus+vodavi+triad+phone+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4451755/normal_6006fe5fe9fd7.pdfIn PDF document text
    • https://cdn.sqhk.co/dowamagova/ij3hjuU/ice_cream_drops.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401694/normal_5fe27fca8ba7b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499935/normal_5fe284e1110c2.pdfIn PDF document text
    • https://cdn.sqhk.co/kinirebuseva/fkGjchc/dominos_pizza_discount_codes_2020.pdfIn PDF document text
    • https://zofazozudu.weebly.com/uploads/1/3/0/7/130739697/1375114.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367287/normal_604cd173d519b.pdfIn PDF document text
    • https://cdn.sqhk.co/fexilejedit/jaiijih/32821505816.pdfIn PDF document text
    • https://nipoxumafoji.weebly.com/uploads/1/3/4/7/134717148/4977302.pdfIn PDF document text
    • https://nejaxadutoxukax.weebly.com/uploads/1/3/4/6/134622523/2041344.pdfIn PDF document text
    • https://cdn.sqhk.co/livaxipovage/hstuAif/79915922644.pdfIn PDF document text
    • https://cdn.sqhk.co/simikitivo/9ifiehb/puxorobovowixejugubo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406241/normal_601a2058aff9b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4f0754e2-f0c4-47db-826b-83042027646c.filesusr.com/ugd/7a11b0_fdf6d2fdc89d4c248c4cf2997c6c7390.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/431a398c-7a93-4acb-8aec-ab9aaa2febb1/50739747988.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/report_of_cioms_working_group_vi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c271d6fd-68cf-4e5e-93da-2ebb865fcd7d/how_to_write_a_text_dependent_analysis_essay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e89568ad-5d32-47ac-90b5-9426dcd9c61d/65630791566.pdfIn PDF document text
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_f4c6b3fc58e74d6395e403ea9a560826.pdf?index=trueIn PDF document text
    • https://8d9f32f1-468a-4e6e-8fd0-236262902e57.filesusr.com/ugd/28860c_d9f896eaa22c4769992580f49921060a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/141bfe9f-e220-4f52-99e0-39a278349d6c/61144860353.pdfIn PDF document text
    • https://9a4203bb-6ff2-4ef1-9c63-3f113f84a884.filesusr.com/ugd/ea9bdf_4afce42316944598a60d8a0df2b7b5b3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/73886436042.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bd0efe3-5549-4e38-8d04-4b0fd6ab9141/68180978055.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E70 5360 bytes
SHA-256: 943e5b6e6359581d53d3cfb28facffcdd91d7175af8f3d740822082cc5a8c215
font_01_sfnt_off00012082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12082 11308 bytes
SHA-256: 333a3e37bd765ec6ebf9487af0c89094ed3f153fab0a30f035cafdbcbf0b933d
font_02_sfnt_off0001474c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1474C 16136 bytes
SHA-256: e204f965de83332cb3fea5ed51eaac1b27a9cb55b0e27dea2e5068077ecf5cc4