Malicious PDF — malware analysis report

Static analysis result for SHA-256 f618d7851a89a4ba…

MALICIOUS

PDF

85.2 KB Created: 2021-02-21 07:47:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 62e27e8a17392b5e2b16f40d8b94ce5b SHA-1: 292a844892eb910c87026e0f787f67c9f23ce798 SHA-256: f618d7851a89a4ba1c50cd6302aa385bcb3bcf0f0bfedcdf0b8e40dab4ae306a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. The document contains numerous URLs, with one specifically appearing to be a redirector for a lure related to 'adobe premiere tutorials'. Although no scripts were explicitly extracted, the PDF format and the presence of external URIs suggest potential for embedded JavaScript or other exploit mechanisms to facilitate the attack.

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://jacksth.ru/strik?utm_term=adobe+premiere+tutorials+for+beginners+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393189/normal_5fda5876e6d1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449424/normal_5fe7ff3d80ad0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461498/normal_6011f3c542fb6.pdfIn PDF document text
    • https://cdn.sqhk.co/rozesivotix/iiigHhi/breckenridge_gold_runner_alpine_coaster_cost.pdfIn PDF document text
    • http://purigoguwoz.22web.org/parquet_format_vs_orc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501775/normal_600115ea3cf19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445116/normal_602bb295da634.pdfIn PDF document text
    • https://cdn.sqhk.co/pubodegosog/ccgdjhw/18415092255.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
    • http://bibijovefuvak.epizy.com/borderlands_2_dlc_commander_lilith.pdfIn PDF document text
    • http://puligop.epizy.com/muzozu.pdfIn PDF document text
    • http://gofozumi.epizy.com/free_template_for_ppt.pdfIn PDF document text
    • http://muvalinifotu.rf.gd/81476361425.pdfIn PDF document text
    • http://najaxobefirag.epizy.com/49174598721.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/bsf_tradesman_answer_key_2019_jobriya.pdfIn PDF document text
    • http://toxuxefegetej.rf.gd/antonio_vivaldi_gloria.pdfIn PDF document text
    • http://lagadasisipas.rf.gd/financial_aid_template_coursera.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10437 5372 bytes
SHA-256: 07cde1d84f92bfab1bc040ee5d5153ae9af358d7210f9f4b638420f047dfb46d
font_01_sfnt_off0001165b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165B 10148 bytes
SHA-256: 0419eca6223ffe691dd3fc5d7104a1dba156ceff7f6e2a0d3c8584a5b19218fc
font_02_sfnt_off0001391b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1391B 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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