Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0081ccf4aa10eda…

MALICIOUS

PDF

71.5 KB Created: 2021-03-02 03:04:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6561d09fe5eb5a0155484768a7d36f0c SHA-1: b037e4694ebfe15d31aadd1271444623687d40d0 SHA-256: d0081ccf4aa10eda54e3dccfe384814e7e0cbd86845cc385e1ac2a9ade3e3857
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though partially corrupted, suggests a lure related to interview questions. The presence of external URIs and the link farm heuristic indicate an attempt to redirect users to malicious sites for further exploitation.

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://druttle.ru/123?utm_term=how+to+answer+would+you+questions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4488315/normal_600a0d55765fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388041/normal_6032e3946aa93.pdfIn PDF document text
    • http://manekobe.22web.org/2018_camaro_convertible_manual_operation.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462985/normal_600c518212ed4.pdfIn PDF document text
    • https://cdn.sqhk.co/kosozezoxuxe/yjbhejh/53650257678.pdfIn PDF document text
    • http://lajodibibodi.getenjoyment.net/how_do_i_access_facebook_marketplace_on_desktop.pdfIn PDF document text
    • http://sukujugonada.22web.org/aretha_franklin_nessun_dorma_mp3_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446401/normal_6009932fce791.pdfIn PDF document text
    • https://cdn.sqhk.co/kibutonap/VIhdzA7/zopogafidojil.pdfIn PDF document text
    • https://cdn.sqhk.co/lokiwejawe/PhbgiLt/39431333498.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvevalor/iKigxgj/webawisiwagovo.pdfIn PDF document text
    • https://cdn.sqhk.co/tofatuxurejo/zigjege/world_market_area_rugs_9x12.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuwubejagogaxe.rf.gd/36538137601.pdfIn PDF document text
    • http://zumadibud.epizy.com/what_are_the_phases_of_software_testing_life_cycle.pdfIn PDF document text
    • http://kugukokoner.myartsonline.com/joketanuninenamefezuzurax.pdfIn PDF document text
    • https://s3.amazonaws.com/gimufesajo/najeva.pdfIn PDF document text
    • http://pevurevakube.rf.gd/cdsco_gcp_guidelines.pdfIn PDF document text
    • http://wujikefixazoni.epizy.com/probation_reporting_online_texas.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7B 5100 bytes
SHA-256: ef56d6598c03bb2075e7b0448bab97ce0220e798c03b4b75a20b43eebe9d64b5
font_01_sfnt_off0000ecf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF0 10584 bytes
SHA-256: 75dcc1c45d1444b9a17871dd2c81f4618e89e5b7a3eca12c569e939acaa17cdf

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