Malicious PDF — malware analysis report

Static analysis result for SHA-256 df08f14fddaae5bf…

MALICIOUS

PDF

75.0 KB Created: 2021-03-25 18:05:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 762f399d74fb4be70ee4e97a2499222e SHA-1: 1474cd3623818ae30f0ff65d2fff38fada4a41ca SHA-256: df08f14fddaae5bf1624c93f7b7f71c5ba8da119a3eea042b55c19c701f5645f
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to PDF files hosted on various platforms, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, appears to be related to search terms, reinforcing the lure aspect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://ponafet.ru/strik?utm_term=bmw+e39+engine+wiring+harness+diagram
    • https://jizojalagakamu.weebly.com/uploads/1/3/4/8/134886497/dodibulunexawuxolam.pdf
    • http://gelufose.scienceontheweb.net/orthopedic_physical_assessment_magee_6th_edition_free_download.pdf
    • https://patewowuxafopon.weebly.com/uploads/1/3/4/5/134595548/1689101eef.pdf
    • https://xukoxaxap.weebly.com/uploads/1/3/4/7/134748194/zawoxaku-rinoxurusor-dumusagipeka.pdf
    • https://warubexe.weebly.com/uploads/1/3/4/6/134647576/jogatejebuwejo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kipejefanowisu.atwebpages.com/gobodex.pdf
    • https://uploads.strikinglycdn.com/files/03506f76-5a8d-4806-b408-b13324f8dd9d/51189829351.pdf
    • https://uploads.strikinglycdn.com/files/3eedd0c3-4cdd-4a9f-9ca1-4b0f1bcd59ca/www.facebook.com_help_delete_account_2017.pdf
    • https://uploads.strikinglycdn.com/files/6433702b-453d-4a16-bd09-4dfc7a281c42/trimble_tdc600_accessories.pdf
    • https://uploads.strikinglycdn.com/files/f8910788-6ca9-459c-91f5-136e30668ad4/hernandez_sampieri_metodologia_dela_investigacion_libro.pdf
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_5c724ef4457e46be9dc366c0ee01d4d2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5bb4a855-7c3a-4ec8-a2e8-c0dc04eb06a4/brown_v_board_of_education_and_the_civil_rights_movement_michael_j_klarman.pdf
    • https://uploads.strikinglycdn.com/files/b0ce09e2-ae8e-4281-b94a-27f64fd92723/zekivakuj.pdf
    • https://s3.amazonaws.com/tirimofufemukat/xukonatudo.pdf
    • https://uploads.strikinglycdn.com/files/d7fb92fd-80d7-470f-8e19-951fd1be6379/is_developmental_disability_a_mental_illness.pdf
    • https://86042ffc-9b62-460b-8552-fb2522205a17.filesusr.com/ugd/4f92c1_b5aafcb810a849209c2b2414c209fff5.pdf?index=true
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e681.bin
534ba67b9827f32e64e405193b97c48fcee2290e09987fb5138c3e48c314c414		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE681 5668 bytes
font_01_sfnt_off0000f9aa.bin
ada659cca9a4bbb35d7beb47245c85628d4fe96f4ad083724586c186f86be43a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AA 10876 bytes

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