Malicious PDF — malware analysis report

Static analysis result for SHA-256 35f9c0d7c843d6af…

MALICIOUS

PDF

80.3 KB Created: 2021-03-19 21:44:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb98392eaef23f47960b4edfe176acac SHA-1: b0d6bece9d46aec079054b94df694a0254868785 SHA-256: 35f9c0d7c843d6afca99096f15b9f80eab349da733af07ec7e3e7d91753b1e70
166 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating suspicious links, including invisible links to potentially malicious domains. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, suggesting it was generated programmatically. The presence of numerous URLs pointing to disposable domains and link farms reinforces the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://gimoguvi.ru/award?keyword=general+english+speaking+questions+and+answers+pdf
    • http://nonretloli.site/85323784973s7prm.pdf
    • https://static.s123-cdn-static.com/uploads/4423431/normal_5ffaa3d41b4f8.pdf
    • http://select-get.top/gewimofiwl45k.pdf
    • http://sogejovep.mypressonline.com/fomik.pdf
    • https://static.s123-cdn-static.com/uploads/4474759/normal_60008397842c7.pdf
    • http://tebeririz.scienceontheweb.net/93041613432.pdf
    • http://pozijuza.scienceontheweb.net/grossman_catheterization_download.pdf
    • http://gipovasota.sportsontheweb.net/pseudo_dionysius_mystical_theology.pdf
    • http://gifavojam.scienceontheweb.net/kazunuxubet.pdf
    • http://ig-supportcenter.xyz/satixudaxozunazumodaejcqg.pdf
    • http://rijigikesezaga.mypressonline.com/free_5th_grade_reading_comprehension_worksheets.pdf
    • http://jigikujed.scienceontheweb.net/faganiputodutanowefoso.pdf
    • https://cdn-cms.f-static.net/uploads/4403938/normal_603c4032b52f4.pdf
    • http://wasatosu.sportsontheweb.net/what_are_the_5_kinds_of_prayer.pdf
    • http://naturfresh.fun/life_smart_heater_owners_manualywttn.pdf
    • http://pevazaw.mypressonline.com/13840260645.pdf
    • http://dfwshootersupply.com/748738549995q3af.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://radiviwix.onlinewebshop.net/7711849121.pdf
    • https://39ad70c8-6a03-4de2-a89b-b0209cba5754.filesusr.com/ugd/d2759c_cb339f5bf7c149f596b2b93e258fc175.pdf?index=true
    • http://jozilaro.atwebpages.com/vijux.pdf
    • https://f3b86e06-b3aa-4ee1-82f7-79049f3379a8.filesusr.com/ugd/0c4fd2_005b86db095747d7bec3acfe001783c1.pdf?index=true
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_72a114d9007e49879b255d472ce5e19d.pdf?index=true
    • http://resilasijajatil.myartsonline.com/how_to_fix_clogged_ink_cartridge_epson.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8f6.bin
fa958d2dab0b2fa70f33fb890870fb66df0ed29796476ff4f11672c2e406974f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F6 5616 bytes
font_01_sfnt_off00010c22.bin
11c11600af93c9a6d3fd403bce2747adca4b5fcf0ad6407b453c278eb9181f6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C22 11044 bytes

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