Malicious PDF — malware analysis report

Static analysis result for SHA-256 f56e1d88bbb7a827…

MALICIOUS

PDF

80.5 KB Created: 2021-03-28 06:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57ffd8727b5e68fec8b5b84b70b8a03c SHA-1: e444f2a2a91e09746378f72109093b9886a9c558 SHA-256: f56e1d88bbb7a82795e18939f263d77ab388b432d960d46c8993971fa15b352e
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The presence of a large number of external links suggests a link farm or phishing attempt, directing users to potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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/123?utm_term=gelee+recipe+sheet+gelatin
    • https://zanazajerepa.weebly.com/uploads/1/3/4/0/134012527/tivaxatikuk-xenorisalab-sisedojajek.pdf
    • http://wejesigozolireb.getenjoyment.net/29329421765.pdf
    • https://cdn-cms.f-static.net/uploads/4457312/normal_604564dbcf1f8.pdf
    • https://static.s123-cdn-static.com/uploads/4407314/normal_5fccfd32be7d5.pdf
    • https://cdn-cms.f-static.net/uploads/4476595/normal_602dc70280557.pdf
    • https://nalatuzub.weebly.com/uploads/1/3/4/3/134324595/sigep.pdf
    • https://deluneruniji.weebly.com/uploads/1/3/4/0/134012649/joxodinezelu.pdf
    • https://paleforekirito.weebly.com/uploads/1/3/4/5/134579508/xofir_wadig.pdf
    • http://worabipupe.mypressonline.com/15771227689.pdf
    • http://ramosek.iblogger.org/bullous_pemphigoid_treatment_guidelines.pdf
    • https://xafinuwexedigu.weebly.com/uploads/1/3/1/3/131379324/2173828.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ba3a7bb5-edd2-4228-b29c-cf272df6a868.filesusr.com/ugd/bd1c09_dda8dca4ead24ca295d14bf7262a6e65.pdf?index=true
    • https://7f2467c6-0d80-4e38-8df7-27624e0b9669.filesusr.com/ugd/e19533_b70a39fdf63c4753988073712498ffae.pdf?index=true
    • https://2b08c346-38d8-4763-b559-bb9d4fff2313.filesusr.com/ugd/40c9d6_1ee6460cd2354c6f9c16fc661a80c311.pdf?index=true
    • https://02796127-04ec-4c85-b270-c6f7310ebb18.filesusr.com/ugd/ce0e6d_d3734482f712479d8cfeab5f812b2ac1.pdf?index=true
    • https://a35aa970-3e4e-4c20-be1f-53d10001bce9.filesusr.com/ugd/af4e73_f51c64b373b14d96b191b204dc91d3a3.pdf?index=true
    • https://d6d3a1c5-32ce-46e9-ae92-c5b8d84d65d9.filesusr.com/ugd/a3b54b_a4d79d8c68a3413c9bf57a5c14d199e5.pdf?index=true
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_14ef45a685fe4ad7aa8cf294fc0b7ffc.pdf?index=true
    • http://biborufa.epizy.com/background_photoshop_psd_files_free.pdf
    • https://f3ea461b-95fd-44cf-949c-5afda193840f.filesusr.com/ugd/a48928_ff7e3782a289487a88d8f9fab354a263.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_off0000fcac.bin
5012bf3a1d37940c0b06e5e824b7ad3340ec824218a1ff50e26466b4d8d03cc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAC 5228 bytes
font_01_sfnt_off00010e71.bin
ebed9b0d7208c848bb7a48d91a7673c85e9453953009463513671b2a093b8008		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E71 11432 bytes

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