Malicious PDF — malware analysis report

Static analysis result for SHA-256 e554c681b7405884…

MALICIOUS

PDF

79.0 KB Created: 2021-03-22 22:11:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb30585d622eb5908b1bf34a44bb6abf SHA-1: 2aea09c7a9269aae63d89b824c3a0fa44b13d042 SHA-256: e554c681b7405884d41f10dbeaf50fda2b1813422e21820cf996bb901970f541
126 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and link farm heuristics points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lozipotod.ru/123?utm_term=personal+loan+agreement+format+in+word
    • http://kulanefimolon.mypressonline.com/lelejadezikuxe.pdf
    • http://kuvezowepo.scienceontheweb.net/76715474626.pdf
    • http://csxmoney.info/rock_band_4_compatibility_list3d5m0.pdf
    • http://nizuvifoko.iblogger.org/what_colour_goes_with_navy_blue_jacket.pdf
    • http://waverufusufafuv.scienceontheweb.net/java_tutorial_for_selenium.pdf
    • http://vawurabel.mygamesonline.org/54197724924.pdf
    • http://boldly-grow.com/how_to_repair_a_freezer_thermostatt46zk.pdf
    • http://jirenaxapibetig.scienceontheweb.net/celestron_nexstar_130_slt_for_sale.pdf
    • http://lnstagram-helping-centre.com/bifozilotelinevobd8gdd.pdf
    • http://nadahul.ru/what_are_some_funny_names_for_zoom0bdhr.pdf
    • http://card2card.live/how_to_describe_climate_weather_differentbpwjb.pdf
    • http://pixidilivutep.medianewsonline.com/how_to_explain_bar_chart_data.pdf
    • http://zusagukitu.mywebcommunity.org/kawenaviji.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://monovopo.rf.gd/livro_atomistica.pdf
    • http://noratev.myartsonline.com/51391019883.pdf
    • https://7fad2989-91b8-457c-89bc-9a0e7aeef19f.filesusr.com/ugd/b03ff3_2b00f0e5a0e84eaa97f5e02214955bcb.pdf?index=true
    • https://ef733714-782c-48ea-8991-1bc0bf0c95f2.filesusr.com/ugd/ad2ade_bfc4fbf37930415784737c6b0c3e8da8.pdf?index=true
    • https://1dab3517-3db0-43ff-9fd6-b65b51f65b60.filesusr.com/ugd/565485_dbea539fdf7f4d9687af09be6987a293.pdf?index=true
    • http://danokob.epizy.com/bid_management_process.pdf
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_9dd952120ed84e2ea1de5275b256c28b.pdf?index=true
    • http://zikixixofav.epizy.com/30294146742.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8dc.bin
6b9c3f54db096173c3bf45f1cacb84aecc8a79344a6d8c7438f346419b6daf0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DC 5108 bytes
font_01_sfnt_off0000fa2b.bin
9beca2cc0ca4d53ee7bd1c754b8ce598b9e820d2c06097a3339d5de36df58abf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2B 11308 bytes
font_02_sfnt_off00012086.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12086 4324 bytes

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