Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f11fed31c9d4e8b…

MALICIOUS

PDF

126.8 KB Created: 2021-04-03 21:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f384ed1c7cb2f2453f1074fe0a233d2e SHA-1: 778ceae18dfded6f1a13f14bc7a2147ad58dfc58 SHA-256: 1f11fed31c9d4e8b508dde6df123006ea33c49332371580234ba1818d886a2c1
164 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 are to PDF files, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to 'Cra installments guide' and 'wkhtmltopdf', hinting at a potential scam or lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/123?utm_term=cra+installments+guide
    • http://vulevon.22web.org/66803299076.pdf
    • https://cdn-cms.f-static.net/uploads/4413235/normal_6062539e59949.pdf
    • https://cdn-cms.f-static.net/uploads/4453721/normal_601cf823ba404.pdf
    • https://cdn.sqhk.co/manizamo/hTjhhjw/35582397996.pdf
    • https://cdn-cms.f-static.net/uploads/4410416/normal_606267114b4e1.pdf
    • https://cdn-cms.f-static.net/uploads/4401555/normal_6018f88d0c8a8.pdf
    • https://cdn.sqhk.co/senuziker/GdFCIjj/9605436647.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0f3c41ac-de96-4ba7-a517-026d7435d592.filesusr.com/ugd/8631de_e33e450a33594d1bb02058d963084ff2.pdf?index=true
    • https://50b7e5d6-ab0e-41ff-bbcb-47d024e5c277.filesusr.com/ugd/45d8ab_64b2c4fc9ade47bab1b2b5b8d9661c49.pdf?index=true
    • http://xotivigafutuzul.epizy.com/calligraphy_alphabets_in_english.pdf
    • https://1c684d3d-b1aa-4d58-8f8e-408f9cf37fac.filesusr.com/ugd/64d889_84ef64e0cda7463ebd28c78d6181dc63.pdf?index=true
    • https://uploads.strikinglycdn.com/files/88e8d972-6433-40dd-910c-27952702dec2/11985804099.pdf
    • https://uploads.strikinglycdn.com/files/69039dcb-51dc-4ee1-a62a-009f4582b88d/how_to_label_circumference.pdf
    • https://uploads.strikinglycdn.com/files/6f01882b-63b5-4696-9eaa-d33f57c2840a/wd_my_cloud_storage_4tb.pdf
    • http://gikuxedikejoba.epizy.com/92768802888.pdf
    • https://uploads.strikinglycdn.com/files/2021bfc7-77a2-47cb-92e7-5a445bdd0d68/how_to_decorate_a_beautiful_christmas_tree.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019fb7.bin
dde1c77a68e48a512be571c784c3c4ea2ec6b9f55ff54a627c0ee75d9016047a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19FB7 5052 bytes
font_01_sfnt_off0001b0c4.bin
cf1dcc229b848ef1617476f36f1e7c32939a1e1df2e1f266df508d6a67a1dd1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B0C4 11564 bytes
font_02_sfnt_off0001d873.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D873 16204 bytes

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