Malicious PDF — malware analysis report

Static analysis result for SHA-256 92d37053445d392e…

MALICIOUS

PDF

86.2 KB Created: 2021-04-08 08:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 07039436599a53e4b20f986e2bc99743 SHA-1: 9f9e99d90dad627c74c01d7c0a38ebf4dcdd17da SHA-256: 92d37053445d392e059d0e893c94e01527a8d5794c57ac8f148481194f7a6aee
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm designed to drive traffic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting numerous URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://druttle.ru/wix?keyword=dna+structure+and+replication+worksheet+answers+quizlet PDF link annotation
    • https://varovugunigode.weebly.com/uploads/1/3/4/4/134480676/jesev-memutujojaz.pdfIn PDF document text
    • https://tijuvenunulufuv.weebly.com/uploads/1/3/4/6/134625509/0049bef0d7930.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445557/normal_601b27fcc85a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380078/normal_6064756b5c2d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463009/normal_605abae3a6f23.pdfIn PDF document text
    • https://filuvinuro.weebly.com/uploads/1/3/4/4/134455556/62355122f9a66b.pdfIn PDF document text
    • https://zozolesib.weebly.com/uploads/1/3/4/6/134631165/rimokevo-zunugigisuza-zejosape.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408471/normal_606e306fcfb17.pdfIn PDF document text
    • https://zitudoxe.weebly.com/uploads/1/3/1/4/131437236/kiwamuvafenuzirunega.pdfIn PDF document text
    • https://basavorulifa.weebly.com/uploads/1/3/4/8/134899730/5360335.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490367/normal_5ffa3a4b2fe79.pdfIn PDF document text
    • https://xurobogi.weebly.com/uploads/1/3/1/1/131163732/nupevaz_keduzolebe.pdfIn PDF document text
    • 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://fa886832-b9e3-4ce5-a98c-97da2614721f.filesusr.com/ugd/9f8050_f07ba944629b4c64a6b4c1618529424b.pdf?index=trueIn PDF document text
    • https://9b704b87-3668-414c-a24e-b30400fe0e33.filesusr.com/ugd/51c472_3210db0ee6734bceb10821f216082813.pdf?index=trueIn PDF document text
    • https://4a0f17ac-6ce6-4c05-9546-25c48d39d9f7.filesusr.com/ugd/cd79e3_bc22ecd9a814491e980cf4d2d8a61e4e.pdf?index=trueIn PDF document text
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_9e4263777eb941d78cc13251669ed94c.pdf?index=trueIn PDF document text
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_09ab00b586c8439581a0d7072ae0646d.pdf?index=trueIn PDF document text
    • https://77cbb24c-feae-490b-854c-0a9d4db21a85.filesusr.com/ugd/3752ea_12fce71521714b828dbdf0ec5e98d1d7.pdf?index=trueIn PDF document text
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_ea1e702e93ab45b9b2a435547cde718a.pdf?index=trueIn PDF document text
    • https://e5b7f393-9b83-42c5-a877-5b85c0c772c8.filesusr.com/ugd/77b42d_ed42358f498345d6b63918a0e828465b.pdf?index=trueIn PDF document text
    • https://df1882fa-13c5-42f1-8438-577935b594b9.filesusr.com/ugd/91932b_efefc925ff444458b18fe694275f9770.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF1 5372 bytes
SHA-256: 2e25d2a5fa9ba1feaa6069c85c54752b0954423dffeaacbeee19831702e82759
font_01_sfnt_off00010042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10042 11536 bytes
SHA-256: 3f2b7e624c02a329b3ead9cda2b1556e33423e9c00c3582937e0678d288134fa
font_02_sfnt_off00012801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12801 16036 bytes
SHA-256: 354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb
font_03_sfnt_off00013c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C69 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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