Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9e949dc0fb9f734…

MALICIOUS

PDF

77.0 KB Created: 2021-03-17 04:11:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a2bab0cc0542bbf1df4444279a0c0ca SHA-1: 5a7da725f8ddd706592dabbb4e30ff5f99415de8 SHA-256: f9e949dc0fb9f734f626eb63123f371f8cd3333d4486368602d0dccc90171a1d
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to potentially malicious or spam-related domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ClamAV detection and ML classifier also flag this file as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious content, likely for phishing or to distribute further malware.

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://xezojetit.ru/123?utm_term=hadronox+druid+guide
    • https://cdn-cms.f-static.net/uploads/4482882/normal_6010670a819e6.pdf
    • http://rasudilikid.mywebcommunity.org/bosuxefagizozagakisenune.pdf
    • http://rifijetuvijilam.medianewsonline.com/xudubazalalo.pdf
    • https://cdn-cms.f-static.net/uploads/4366031/normal_6024596d1b9ab.pdf
    • https://cdn-cms.f-static.net/uploads/4403274/normal_600f4899441a9.pdf
    • http://rowowesofazov.medianewsonline.com/which_of_the_following_statements_is_true_regarding_cost-plus_pricing.pdf
    • http://kugewezebuvigiw.mygamesonline.org/xojiwibimezevapobupatuwil.pdf
    • https://cdn-cms.f-static.net/uploads/4394066/normal_60162bffceb5c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c18d9829-3add-4afa-bc87-35007fe3998a.filesusr.com/ugd/70c1ec_74d81f55aa234f28b4810e78c3d0e828.pdf?index=true
    • https://96a9e3af-f0c3-4048-9e6c-0ad8da3c6018.filesusr.com/ugd/15d534_6b5f4b2eb802481e8f6dbfe9ec5cd8ae.pdf?index=true
    • https://8dac4d01-2cd1-45d2-8b5f-6005f802adc9.filesusr.com/ugd/1f96ce_f62a025e97d64b73af329f3949e1be41.pdf?index=true
    • https://0c2a7d7b-be9d-4ef2-a94c-09ca905cc17d.filesusr.com/ugd/7d21c0_b781d18026d04d6f86e91e22523c1a07.pdf?index=true
    • https://01477de9-116b-42a6-a62c-54244336611e.filesusr.com/ugd/dea9e9_4a944910ecf34a869a6e65f132de1f15.pdf?index=true
    • https://f171294f-ed7a-4884-a773-1e826a512430.filesusr.com/ugd/20d861_702e93fa43ae459996a3abc41bf7a711.pdf?index=true
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_3ae4fe24a5c34b9f99b48acd9b286965.pdf?index=true
    • http://pupagerirawax.myartsonline.com/41316197901.pdf
    • http://susabumo.atwebpages.com/vezetojamufisepum.pdf
    • https://34570882-574e-4d25-8c0e-d8b9b6c2967f.filesusr.com/ugd/cb2bed_fd5d93ac59724714a97ea81774da2b54.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
    • 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_off0000d9b6.bin
a730276c18f2171a74aff2d62bc88b387ea9722134ad723bce9716f60d7c7dfa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B6 4812 bytes
font_01_sfnt_off0000ea20.bin
5e9f71d8c793a108cae4678b2718342ac12bdc1fb2700207ca9a28a863717d22		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA20 11376 bytes
font_02_sfnt_off00011010.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11010 16204 bytes

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