Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2e41854d9b93d81…

MALICIOUS

PDF

88.9 KB Created: 2021-03-01 06:28:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 7b33a2024535a791a1e7d55a576ee3b1 SHA-1: e5e814eff2ffbd018ad5cb4fe616f6f66fd1921b SHA-256: c2e41854d9b93d816ed651193b49f10b6790553466b9c2c43b30d1f308971e54
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains numerous embedded URLs, many pointing to disposable hosting, and is identified as a link farm. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of embedded URLs indicates an attempt to redirect the user to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/strik?utm_term=the+stranger+book+albert+camus+summary PDF link annotation
    • http://ca-management.website/tri_fold_brochure_template_publisher_2016w2v4o.pdfIn PDF document text
    • http://zagejudivavi.sportsontheweb.net/amor_y_el_respeto_frases.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370528/normal_5fd6db2fa13ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475204/normal_5fe79aa50b9e2.pdfIn PDF document text
    • http://phtech.site/hold_my_hand_song_ringtone7kvgx.pdfIn PDF document text
    • https://cdn.sqhk.co/tekemozuj/QGjhs0J/64624243116.pdfIn PDF document text
    • http://oblakova.ru/58933878659v3ika.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454303/normal_5fe3f16e9c4a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475730/normal_6015fdbc327ae.pdfIn PDF document text
    • http://pokupka.space/mexican_party_invitations_free_templatepi9ph.pdfIn PDF document text
    • http://tendernes.ru/amgen_safety_net_foundation_replacement_form7o8sy.pdfIn PDF document text
    • http://kunujunekedi.mygamesonline.org/sony_bdv-e3100_3d_blu_ray_home_theater_system.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468837/normal_6021a42b396a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370309/normal_5fdbcc039e962.pdfIn PDF document text
    • http://moitender.org/frostborn_coop_survival_pcfob1n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416660/normal_5fdf6da076a76.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tavoxelelenasi.onlinewebshop.net/what_are_some_policies_in_the_us.pdfIn PDF document text
    • http://disoluje.myartsonline.com/88459167388.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CE 5468 bytes
SHA-256: 2d84ee16de52b49552c58b26ce2bf258f9f7ea7671d7415785b94a99c642ccf9
font_01_sfnt_off00011b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B49 11352 bytes
SHA-256: a012b409971eec662887ce972d9dacbc9f3be3afb5b66ef49c824a9ffc71aee5
font_02_sfnt_off0001416c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1416C 16100 bytes
SHA-256: 1be743c11efd1db6eb0b1d59ff599fce1244630bd3a52e256ed85df637fffceb

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