Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4ed738468f14d4f…

MALICIOUS

PDF

68.1 KB Created: 2021-03-01 02:19:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b2e0e085dae15646e93675c91f3a8258 SHA-1: 0e90941d03251f876746b65d490696d83ad78838 SHA-256: f4ed738468f14d4f3d40c45232aea43910964f6083eb9230b25bc68ccf4a5db2
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged as malicious by ML classifiers and ClamAV. It contains a large number of embedded URLs, many pointing to disposable domains or link farms, suggesting a phishing or redirection attempt. The document body is heavily obfuscated and does not provide clear textual content, but the presence of numerous external links is a strong indicator of malicious intent, likely related to spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://crophysi.ru/award?keyword=hpi+savage+25+engine+rebuild+kit PDF link annotation
    • https://cdn.sqhk.co/liripudeb/XhgiabN/85202975308.pdfIn PDF document text
    • http://genogiwibodel.iblogger.org/lilosiwopizoxakamufabuji.pdfIn PDF document text
    • http://vijufik.iblogger.org/what_is_the_significance_of_religion_and_spirituality_in_our_society.pdfIn PDF document text
    • http://manamuposa.getenjoyment.net/xexijibi.pdfIn PDF document text
    • https://cdn.sqhk.co/dowivita/gjjjnYs/turkey_hill_tripolitan_ice_cream_flavors.pdfIn PDF document text
    • https://cdn.sqhk.co/jawuraxexije/icicggZ/subway_princess_runner.pdfIn PDF document text
    • https://cdn.sqhk.co/kizafizutuw/gggje5Q/kong_classic_puppy_dog_toy_medium.pdfIn PDF document text
    • https://cdn.sqhk.co/salifera/D7Hpieu/vusosokudukogurofip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/bein_sport_live_apk_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/9427948185.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/pijineza.pdfIn PDF document text
    • http://zarugosa.epizy.com/canchas_de_futbol_7_cerca_de_reforma.pdfIn PDF document text
    • http://xomewipasi.rf.gd/eficiencia_y_equidad_economica.pdfIn PDF document text
    • http://fopopas.epizy.com/contract_law_consideration_cases.pdfIn PDF document text
    • https://s3.amazonaws.com/popilo/zifotewejitijo.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_off0000cb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB72 5608 bytes
SHA-256: 6779b303aaee11a4abd9ccda9bd89122399d0c40b93ad7920fc8968ca7245116
font_01_sfnt_off0000de99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE99 10376 bytes
SHA-256: 38e97c037d41db8e945722850dcbb7114b58abf6adc7ba1c65f806f91efd739e

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