Malicious PDF — malware analysis report

Static analysis result for SHA-256 cec5d64b93ebd01f…

MALICIOUS

PDF

64.1 KB Created: 2021-02-16 13:55:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 713168975d2ae02ae3f1d75e32f4d0d0 SHA-1: a76fbd046ff398d234f94073ae1b9c4bea72b525 SHA-256: cec5d64b93ebd01fd442c231cd821bbb95f3462b09b717c2cded709b9d22614b
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 embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

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=how+to+program+chamberlain+garage+door+opener+remote+953cd PDF link annotation
    • http://idealica-ituficiale.website/ionic_bonding_worksheet_high_schoolgquxq.pdfIn PDF document text
    • http://shopsmmv.site/absolute_java_4th_editionkhl6j.pdfIn PDF document text
    • http://freds.space/the_breakfast_club_movie_script95ixf.pdfIn PDF document text
    • http://nuveclovet.xyz/28306055705gjfag.pdfIn PDF document text
    • https://cdn.sqhk.co/nujekezitifi/wbO0Dgf/90182206639.pdfIn PDF document text
    • https://cdn.sqhk.co/dilizilozok/gghMgdw/the_dictator_2012_free_download.pdfIn PDF document text
    • http://teksol.xyz/swot_diagram_template_wordoits1.pdfIn PDF document text
    • https://cdn.sqhk.co/tavikagisato/ibgft9P/miwaro.pdfIn PDF document text
    • https://cdn.sqhk.co/takivelalam/iIv71mB/momo_horror_fake_call.pdfIn PDF document text
    • http://redpandarecycling.com/jizopumituwawuzusuviwubxzw.pdfIn PDF document text
    • https://cdn.sqhk.co/norumuwapa/hfiiJzX/cutest_animals_that_will_kill_you.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450502/normal_601bcf44e0d3e.pdfIn PDF document text
    • http://reduslim-officialsite.site/depejasinisixeguzaxafijjeacr.pdfIn PDF document text
    • http://izzzaaa.space/subtlety_rogue_pvp_guide_3._3_5g1o36.pdfIn PDF document text
    • https://cdn.sqhk.co/dubikureta/icoXjcm/49747760969.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wifexigupokot.epizy.com/pazedesukafax.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_off0000bd8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD8B 5948 bytes
SHA-256: f32a016428ff7b1203936b470f32935c2e601b7ab007c29a8a9d656bac22371a
font_01_sfnt_off0000d1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A6 9744 bytes
SHA-256: 87f9e2f2e998acea53365e394d653206eac3cb9ec918534b83d6c0bae11edd7c

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