Malicious PDF — malware analysis report

Static analysis result for SHA-256 162bbf128797eb23…

MALICIOUS

PDF

67.0 KB Created: 2021-03-28 05:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: fc6888eff8127fe4098648b8cc40a311 SHA-1: d3cb21ebde9cb96ffb545a75e0aa8c281f16e981 SHA-256: 162bbf128797eb236c8733668c73791c11b1415160df4937ec532e1e7b626d56
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains an embedded URI pointing to a URL that mimics a search result for a specific book, suggesting a phishing or social engineering lure. The PDF also leverages a link farm on disposable hosting, further indicating malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/award?keyword=atlas+hematology+book+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385434/normal_603584d775a49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412890/normal_601f992c6c416.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373243/normal_60143578e9fba.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://clubstore.info/samsung_hw-j355_power_cablehdbm8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475194/normal_603e32e803050.pdfIn PDF document text
    • http://msertis.xyz/56135008513aup1x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489257/normal_60446921208bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450048/normal_603e5c1d68eff.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2b08c346-38d8-4763-b559-bb9d4fff2313.filesusr.com/ugd/40c9d6_6fd7e367d63e43819b82167bfe1520d3.pdf?index=trueIn PDF document text
    • http://gejuzimeru.rf.gd/cgmp_guidelines_according_to_usfda.pdfIn PDF document text
    • https://eb22cd64-ba88-4d74-9269-d2b8937e52af.filesusr.com/ugd/3b217d_91c777ba33fe42f083dbca4d37333013.pdf?index=trueIn PDF document text
    • https://041c2bdd-267b-4995-9d72-d071cf2c2b2b.filesusr.com/ugd/ba0b69_fd4443df103a4f788cd795683da35e18.pdf?index=trueIn PDF document text
    • https://ac734925-007a-49fa-9a6b-2340142042ec.filesusr.com/ugd/ea78e0_7706da454975421d9311e8faa6f3c52e.pdf?index=trueIn PDF document text
    • https://aa700e4b-9450-4a85-8b7e-8c92ffe47626.filesusr.com/ugd/de972d_9e4dbcf78a804be389c3ae58a862d42a.pdf?index=trueIn PDF document text
    • http://kovemipenege.rf.gd/terin.pdfIn PDF document text
    • https://855e1e5b-0daf-4dce-aa73-dfad2bfec5df.filesusr.com/ugd/ced2dc_1b83bbd389d94459abaec6ad12f2c725.pdf?index=trueIn PDF document text
    • https://4fd47d7d-96cb-4cdc-943f-55997d715fc9.filesusr.com/ugd/ab3424_6b22b3690856466a810e1b550f7caffa.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87A 5656 bytes
SHA-256: 6ef726b506edab0dd4dba70d26963d4ba5595661fd8f3d30682aebb380dfe9fb
font_01_sfnt_off0000db99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB99 10412 bytes
SHA-256: 670a24c1749002535ee19f8d68f95b76093dff5b3a1f74df810a943d4b0b2585

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