Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfcca961528f53d5…

MALICIOUS

PDF

71.6 KB Created: 2021-04-26 05:42:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5dc7120f6754f3e405c752a859e8cf2 SHA-1: 161469d04ddf9918704525773d1c38f5a0fd0c65 SHA-256: dfcca961528f53d5afc6b218e6c60ac6ee65a19ab0024af7fc934a2479166bbd
186 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm containing numerous external URLs, with a high ML classifier score and ClamAV detection indicating malicious intent. The presence of external URIs and a link farm suggests the document is designed to redirect users to potentially malicious websites, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jumiwimov.ru/strik?utm_term=plant+city+high+school+soccer+schedule
    • https://cdn.sqhk.co/teforoke/jjyTOhi/kikejalifaw.pdf
    • https://dibumofum.weebly.com/uploads/1/3/5/3/135313591/bepajewurojedom.pdf
    • https://topodomero.weebly.com/uploads/1/3/2/6/132696018/doxuvobu.pdf
    • https://fowowudajij.weebly.com/uploads/1/3/5/3/135312379/rofixijike.pdf
    • https://venatijaw.weebly.com/uploads/1/3/4/6/134680547/ca7ca1e86.pdf
    • http://albl.ru/wezujejuoxzgv.pdf
    • https://durabaseduxoj.weebly.com/uploads/1/3/4/2/134235759/05ce3de73.pdf
    • http://my-favshopf.online/kitchenaid_5-quart_artisan_tilt-head_stand_mixer_black_mattecfvss.pdf
    • http://xelasurugopu.mywebcommunity.org/dell_sound_drivers_free_download_for_windows_7.pdf
    • https://cdn.sqhk.co/tovozovuzedu/7nsijdg/keep_talking_and_nobody_explodes_ps4_trophies.pdf
    • https://zukujiwad.weebly.com/uploads/1/3/4/4/134491014/6530930.pdf
    • https://midusafamiriron.weebly.com/uploads/1/3/4/7/134702540/4093b2c.pdf
    • http://vefefex.iblogger.org/carteira_de_vacinao_animal.pdf
    • http://spindlndou.space/tivapobw3oe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bisobegavur.epizy.com/craftsman_12_inch_band_saw_blade_guides.pdf
    • http://jiwodiw.myartsonline.com/57486766040.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_off0000d8d1.bin
57c1f75fbbc7cbfcd6b68bd4c97230012769b56fc7ff477386614513cff702fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D1 5304 bytes
font_01_sfnt_off0000ead9.bin
f9b0c54d7eaa0111499f955299264987fc28d254b92de22f5507df17af429822		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD9 11548 bytes

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