Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb4cc4bfaffa448d…

MALICIOUS

PDF

84.4 KB Created: 2021-04-13 19:30:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 460ff934ade40c9393a98332e028de87 SHA-1: 273d1afcca4e21ee0736a1ab07357a3e677191ac SHA-256: bb4cc4bfaffa448db12ec54b13907ad4b76803e14adb9f3d966c5c5291faf10a
164 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, indicative of a link farm for SEO manipulation, and a heuristic firing for a 'download button' lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded URLs point to potentially malicious or suspicious domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • 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://botokaw.ru/strik?utm_term=killing+pablo+movie+2011+download
    • https://cdn-cms.f-static.net/uploads/4389104/normal_604d7a388dd39.pdf
    • http://danoguvokapijof.medianewsonline.com/the_performance_appraisal_question_and_answer_book.pdf
    • https://repugonajipivup.weebly.com/uploads/1/3/0/8/130814926/mubafukatabepi.pdf
    • https://cdn-cms.f-static.net/uploads/4407302/normal_606e8e81ddf92.pdf
    • https://cdn-cms.f-static.net/uploads/4415937/normal_6067aa73d5883.pdf
    • https://waguxezemi.weebly.com/uploads/1/3/4/7/134703223/pizixukazi.pdf
    • https://pifabevab.weebly.com/uploads/1/3/4/7/134721676/c1246b33897c49d.pdf
    • http://xolokeminapi.getenjoyment.net/hammersmith_infant_neurological_examination_form.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c4bedd8b-a3e9-4aa8-9751-a6fde4035b7e.filesusr.com/ugd/037f08_95294b0020934ca4a4832d7b2c64bf21.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c7071a89-b411-462b-b77e-064cd80882d3/conclusion_in_biology_lab_reports.pdf
    • https://uploads.strikinglycdn.com/files/78d7f6a6-7cef-4b81-b8f2-89dfc4e53e70/wubur.pdf
    • https://662517ce-f374-4037-aebd-99b1dbe00103.filesusr.com/ugd/0c4177_2f5a91e7d51244dd876f18de5a78096f.pdf?index=true
    • http://supuwevul.atwebpages.com/texobonekoxe.pdf
    • https://7ce190f9-fb8d-496c-a51a-ce151dcc024a.filesusr.com/ugd/e72def_822011e40b7042439ae71f3ffed8d49f.pdf?index=true
    • https://f4b9ed98-44c1-44e6-9966-d9817cd43de7.filesusr.com/ugd/9ced5d_c296d6e6760943d29ce35d17825dcc23.pdf?index=true
    • https://uploads.strikinglycdn.com/files/02149265-4981-456d-9e58-ef50d06c62e3/21233459186.pdf
    • https://uploads.strikinglycdn.com/files/6f4a07cd-f7ab-459f-9f2e-23a6968cd60c/likafosurubog.pdf
    • https://d4f4546a-a836-4b3d-8651-c56b89608eca.filesusr.com/ugd/3e9e83_7ec31312bd294dbd8e29a2afee0fc864.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4e3ee022-d5d9-4d4a-8996-dee3667e40ca/40932347639.pdf
    • https://uploads.strikinglycdn.com/files/76f755f0-7dd5-4905-b3c9-c1a38957eb62/do_all_diaper_genie_refills_fit.pdf
    • https://uploads.strikinglycdn.com/files/8b5afd7b-a516-46c5-b785-a43e5934ffeb/what_is_the_next_sims_4_update.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001298b.bin
65e302b0545f06a081748019ba4e3213fff43426fe331d8828f7ea1b44681b21		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1298B 17736 bytes
font_00_sfnt_off0000f215.bin
767c71a0b80addbf7760ef6365268d24db6b8e2c108be0edd8fb7149bfdd38b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF215 5592 bytes
font_01_sfnt_off0001052a.bin
d666cbe460c06aef879c0605e5915544b4f372db0f9315c26706058dbf0699b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1052A 10608 bytes

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