Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c6d519c1a30f607…

MALICIOUS

PDF

77.6 KB Created: 2021-04-04 15:16:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 863ccf4211e0c021344a459824145b26 SHA-1: 24fc96d1a62f66fdf2962cd5d58192b63e8546b0 SHA-256: 9c6d519c1a30f6071d5b3dec8cc7a74cf848a22e0e7372aba10c63128d2f8f95
126 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including a medium-severity rule indicating it is a link farm hosted on disposable domains. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs, such as https://seumenha.ru/strik?utm_term=the+things+they+carried+quotes+about+stories, likely serve as lures to further malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://seumenha.ru/strik?utm_term=the+things+they+carried+quotes+about+stories
    • https://gutinevar.weebly.com/uploads/1/3/4/6/134611255/taboxage_nedawagonat_zisenetunimuse.pdf
    • https://cdn.sqhk.co/muzedikerum/Ej7Yhe8/cdfm-_a_study_guide.pdf
    • https://goxatuzibifonev.weebly.com/uploads/1/3/0/7/130739188/fidekewugotamasu.pdf
    • http://creditreportfast.info/what_protein_can_you_eat_on_low_fodmap_dietrtsq8.pdf
    • http://ing-cliente.com/fidorewukapoe9z5k.pdf
    • http://hookup157.fun/mensa_brain_teasers_with_answerseh5x4.pdf
    • http://dimax.website/wemopavinomawupatirosubvj.pdf
    • https://nutiduvurenomal.weebly.com/uploads/1/3/4/6/134681926/pinikexejajavit-kobufiziba.pdf
    • https://botabire.weebly.com/uploads/1/3/4/6/134629411/6209960.pdf
    • https://metoxuxiduwano.weebly.com/uploads/1/3/1/6/131636764/bovijadu.pdf
    • https://cdn.sqhk.co/zalivelo/QGjgYjj/dibamifobezufosaz.pdf
    • http://pejazadajenatew.getenjoyment.net/venice_italy_map.pdf
    • https://sirabirimafo.weebly.com/uploads/1/3/0/7/130739431/3023798.pdf
    • http://xojuxelase.medianewsonline.com/87064127302.pdf
    • https://vafuzetok.weebly.com/uploads/1/3/2/7/132740798/vozawezisogizonud.pdf
    • https://poniparo.weebly.com/uploads/1/3/4/6/134610273/e2894bc.pdf
    • http://vibijinit.scienceontheweb.net/automatic_exposure_control.pdf
    • http://zavulibalox.mypressonline.com/leruwavereko.pdf
    • https://cdn.sqhk.co/janezewufaj/iEpjiqO/smart_board_tic_tac_toe_template.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xakusineba/tefiwuzavix.pdf
    • https://s3.amazonaws.com/mujevubutukoxu/71937324062.pdf
    • https://s3.amazonaws.com/tumuzu/how_to_find_zodiac_signs_new.pdf
    • http://kipazafar.atwebpages.com/maytag_2000_series_washer_not_working.pdf
    • https://s3.amazonaws.com/nijudow/11716897421.pdf
    • https://s3.amazonaws.com/tumasun/kuzomoverifo.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_off0000f124.bin
ad90540d1b547ab5c571115950cf6eb29410b90e6b3ef09ba4588e2e13e63497		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF124 5488 bytes
font_01_sfnt_off000103ca.bin
c48f6e606b4dee0e8f6b6eca1a7b8574ea7ba778c765c047e696c09ec9c53242		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103CA 10360 bytes

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