Malicious PDF — malware analysis report

Static analysis result for SHA-256 da41f17b58d31f76…

MALICIOUS

PDF

76.3 KB Created: 2021-04-26 19:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8dd6d3a44d6190c4df2b9b8149ab8c13 SHA-1: d423e987eec5fff65c09c22c64dff8db8f46850a SHA-256: da41f17b58d31f766d31c5020c2ba1bfbf6e328b106ef5dba3ae34eae4f5c77e
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable or suspicious domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though partially corrupted, suggests a lure related to 'interview questions'. The presence of external URIs and the overall structure indicate an attempt to redirect the user to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ponafet.ru/strik?utm_term=interview+questions+hiring+managers+should+ask
    • https://jesaguxofugu.weebly.com/uploads/1/3/4/6/134659129/wefewinavefilifibi.pdf
    • http://baderezu.scienceontheweb.net/what_does_the_acronym_rice_stand_for_why_do_we_care.pdf
    • https://static.s123-cdn-static.com/uploads/4456135/normal_5fdd92ef87442.pdf
    • http://rejawulomov.mywebcommunity.org/gokiruxexunivilajuvipasux.pdf
    • https://cdn-cms.f-static.net/uploads/4426955/normal_5fdc7d433cae7.pdf
    • https://static.s123-cdn-static.com/uploads/4369331/normal_5ff7760833f15.pdf
    • http://parexapubep.iblogger.org/acurite_5_in_1_wireless_professional_weather_station_review.pdf
    • https://cdn-cms.f-static.net/uploads/4419236/normal_5fd663d23a284.pdf
    • http://vofufime.mypressonline.com/pezufanevunok.pdf
    • http://kafalogu.22web.org/ap_seminar_irr_examples_2020.pdf
    • https://wojawodexof.weebly.com/uploads/1/3/4/6/134673733/sugumigukukefoniv.pdf
    • https://videxopejevis.weebly.com/uploads/1/3/5/3/135333638/talexomut.pdf
    • http://numulul.mygamesonline.org/jibapegalexo.pdf
    • https://nibebelijatod.weebly.com/uploads/1/3/1/4/131452937/4bf1060c0768.pdf
    • https://static.s123-cdn-static.com/uploads/4492575/normal_5ff8d80fa1ead.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jojixeme.rf.gd/42459041945.pdf
    • http://vuxepogi.atwebpages.com/23391073261.pdf
    • http://dejedizanabi.epizy.com/34552974799.pdf
    • https://s3.amazonaws.com/jidagafinuxesu/vogelelujepizajekapa.pdf
    • https://s3.amazonaws.com/pokorevalaxex/75823378716.pdf
    • http://weralawubuzeg.epizy.com/giovanni_berlinguer.pdf
    • http://dugexirawotuv.rf.gd/diario_del_gran_asedio_de_malta_1565.pdf
    • http://pixagikaw.epizy.com/95073570880.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_off0000eafb.bin
82df9f7a245aed0ed85ac484adbe6a75c9668bc48fdb4800fd8649c227f9106b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFB 5520 bytes
font_01_sfnt_off0000fd9f.bin
6082339573f751a44efdea9f007ddac623b0808ace2326c0a6fc95aa2746faa9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9F 11676 bytes

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