Malicious PDF — malware analysis report

Static analysis result for SHA-256 4017051d89c56fac…

MALICIOUS

PDF

78.1 KB Created: 2021-03-17 14:54:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3cf0f06a5b3a724094f7896f58bcd74f SHA-1: 58d5ae5cda83002fb4c9dbcb9335b8bf460ed641 SHA-256: 4017051d89c56facf266273dc1bf36558b99de08e605b309d176eb6b44131028
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to seemingly unrelated SEO-optimized content, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/award?keyword=electro+pneumatic+cylinder+catalog+pdf
    • https://degobevotu.weebly.com/uploads/1/3/4/3/134393677/f1fd040891589a.pdf
    • https://vopemafewiza.weebly.com/uploads/1/3/1/4/131408930/sodijufezoresum.pdf
    • http://rakadan.sportsontheweb.net/microscopio_optico_composto.pdf
    • http://lurubalopare.sportsontheweb.net/el_espacio_interior_anselm_grun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_a62b4b9348a142c0a81c348e479491d7.pdf?index=true
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_89eaa37a03d24f118ea79eb10f666d11.pdf?index=true
    • https://s3.amazonaws.com/fujadabez/kinds_of_adverbs_worksheets_for_grade_4.pdf
    • https://1f9cfe0c-d655-4514-b58a-75380282e405.filesusr.com/ugd/d31784_c1e7bafdca66455aa34c332ea463dab1.pdf?index=true
    • https://247e77cc-5367-4382-8586-7c5891409f42.filesusr.com/ugd/2dbf5a_21f524962bf64f1c8c0eb3a45f04e398.pdf?index=true
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_5f9ff4faef4445fa87036da7d0b37b27.pdf?index=true
    • https://s3.amazonaws.com/figidireki/classroom_english_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/0e9a6c09-c881-46e6-9185-31d8ef9d74e1/warhammer_fantasy_rulebook_8th_edition.pdf
    • https://uploads.strikinglycdn.com/files/8c02071c-fae8-412f-96a3-88b546d19fd4/59552994801.pdf
    • https://s3.amazonaws.com/supefujoxopubu/84979940667.pdf
    • https://s3.amazonaws.com/bipovoromoj/66140355980.pdf
    • http://gafodix.myartsonline.com/wuwadopuju.pdf
    • https://s3.amazonaws.com/piradi/48165745432.pdf
    • https://5e54824a-8208-41b0-8aeb-7c017e8cfb46.filesusr.com/ugd/f64db8_e12dac5e9a3643aeb95613048b077a56.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ac027f94-49be-4f7e-a108-7bb963f812db/where_to_buy_books_in_different_languages.pdf
    • https://fccd5518-64e1-462d-9dbe-8d8d8a19ca7a.filesusr.com/ugd/eb005d_97839088f691493fa2142fba840d319e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2c0b878d-11dd-4ad8-b75a-0d3b292fac5d/are_electric_toothbrushes_bad_for_your_teeth.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f459.bin
c2845ffd3644a4179d2bf1248488b14136748e3b2df14ce05b9fdf5fa94aaf6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF459 5356 bytes
font_01_sfnt_off0001068c.bin
59a824fcc9b1e449adfa5021ef3dba0b6d519e249dd0d0326313efed2db4c87b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1068C 10284 bytes

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