Malicious PDF — malware analysis report

Static analysis result for SHA-256 faa82bf5a1e6d477…

MALICIOUS

PDF

80.6 KB Created: 2021-04-23 03:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d8af4ac337161424819e36ebfa0010fc SHA-1: 892f5b092b57fc8b255b42f08057695b741f5a1a SHA-256: faa82bf5a1e6d477383a809c3f0eae4a6788a8ce850119e18242bfd6e227c650
194 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many hosted on disposable domains, indicative of a link farm designed to obscure the ultimate destination. The presence of a 'download' button lure and a high ML classifier score strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and link farm behavior are consistent with phishing or redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leonvi.ru/strik?utm_term=the+god+ask+resources PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://c1cb471f-fc5c-4ef2-b3e1-4d0d0d09d135.filesusr.com/ugd/cc5b41_e78d8521bb8f4a1caced6454001e7b71.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/vuvakadofududimosikofile.pdfIn PDF document text
    • https://e321b6f2-2a0a-4c58-8c60-26baf46d82f1.filesusr.com/ugd/14900c_f8a3043e19d2415dbbc41543f6708bf1.pdf?index=trueIn PDF document text
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_49a003d67b974a609a1ee014452a6219.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/how_do_i_get_my_fire_tv_remote_to_control_volume.pdfIn PDF document text
    • https://0dc5016f-38c0-4e11-84f4-4717e3ef4ec7.filesusr.com/ugd/4fd84c_35a77621ef5b44478b8dca2845f3692e.pdf?index=trueIn PDF document text
    • https://80c93ba6-74df-4afb-9852-3a83eaba20e3.filesusr.com/ugd/4cf28d_24316a8a8a5b4eff9e0fa9a19d5d1709.pdf?index=trueIn PDF document text
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_6ec618278ba948eea466ec1c57ccb36e.pdf?index=trueIn PDF document text
    • http://tunufefenus.rf.gd/giselijijuwisar.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/formation_agriculture_urbaine_bruxelles.pdfIn PDF document text
    • https://dfde94ff-8c6c-411d-9c04-f18b57906ec7.filesusr.com/ugd/47ec90_25c4b071f50249519ea4057b7b250c95.pdf?index=trueIn PDF document text
    • http://fapebelobiso.epizy.com/81859541603.pdfIn PDF document text
    • https://00eaa6b3-f026-4720-b00f-fafb40066352.filesusr.com/ugd/d498be_2b8379ca9f9f41f18af0208bce2c7bc7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a65f91c9-4032-4917-8afc-31cf11f42697/what_does_a_gunners_mate_do_in_the_coast_guard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/259af6b1-756c-4b9c-aee7-781ab1b37621/does_costco_carry_tv_ears.pdfIn PDF document text
    • https://61df3396-90b5-4b69-a3ae-475c9da6ebc5.filesusr.com/ugd/516574_b2e92c2f24454d00bae15a9d61ee8ff5.pdf?index=trueIn PDF document text
    • https://2aa0b900-127f-4603-a19a-6a731d3c9eb1.filesusr.com/ugd/5eaffa_4b3c34c20de24961a8d632c3904b5192.pdf?index=trueIn PDF document text
    • https://07f52280-50dc-49c2-beec-a2e30bf849d0.filesusr.com/ugd/7b8f90_35e39091f9094f3fbcd80c471dc417be.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000effa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFA 4832 bytes
SHA-256: 2a8a4e4df1727f42b8001072cf3c4efab265d373b24eb1bff514a18e99614e0b
font_01_sfnt_off00010070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10070 11592 bytes
SHA-256: c3fb9ad9fd775e8f56a2248015295ea45ac31b25eb1731dc66b972793ca3a0b9
font_02_sfnt_off00012766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12766 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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