Malicious PDF — malware analysis report

Static analysis result for SHA-256 234bb671215b43ca…

MALICIOUS

PDF

61.7 KB Created: 2021-02-16 21:55:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b136dddbb67e132e86f0af58103284eb SHA-1: 2b2688e5f74c6abb9b743795b600c27951fb8851 SHA-256: 234bb671215b43ca980118456711c5b1e18b40a70945d17f2103583127bd1a31
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as PDF files, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URLs are likely used to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://jottigo.ru/strik?utm_term=can+you+take+your+drivers+test+online+in+georgia PDF link annotation
    • https://cdn.sqhk.co/gobajejuz/eMkCgfA/17375578322.pdfIn PDF document text
    • https://cdn.sqhk.co/kamugututu/ghdjhg3/3301754531.pdfIn PDF document text
    • https://cdn.sqhk.co/kerodamajop/hjAjhCa/amc_30_olathe_kansas_movie_times.pdfIn PDF document text
    • https://cdn.sqhk.co/kitaparek/ghugfS5/card_scanner_software_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/rumomezojeku/giLicid/27414486265.pdfIn PDF document text
    • https://cdn.sqhk.co/vedanoderifu/hfdhjoX/bts_dynamite_video_song_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/noxivudeva/jPTgfbr/nokifapurasuku.pdfIn PDF document text
    • https://roralolew.weebly.com/uploads/1/3/0/7/130775143/midawemiwasopasida.pdfIn PDF document text
    • https://rulipativix.weebly.com/uploads/1/3/1/6/131607363/effd1.pdfIn PDF document text
    • https://sijetuso.weebly.com/uploads/1/3/4/4/134499475/kosatote_lezoxotijedi_powope.pdfIn PDF document text
    • https://cdn.sqhk.co/widafopaj/b6jCJ7A/moto_traffic_race_2_multiplayer.pdfIn PDF document text
    • https://finuvowevemez.weebly.com/uploads/1/3/5/3/135397693/385cd04.pdfIn PDF document text
    • https://cdn.sqhk.co/mepowokugo/5JITg0t/99346888770.pdfIn PDF document text
    • https://cdn.sqhk.co/salasereki/fVAhX9G/22192375410.pdfIn PDF document text
    • https://cdn.sqhk.co/poronujefino/kbphgMp/fairy_tail_high_school_au_fanfiction.pdfIn PDF document text
    • https://cdn.sqhk.co/jisujesox/jadHeja/angry_bee_evolution_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/xelajuwodaf/jbjf1TX/gold_mountain_omaha_156th_and_maple.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6EB 5124 bytes
SHA-256: 781f0417c3d86d65d27dcf259694046828df73691bebcc505f7679194a711a60
font_01_sfnt_off0000c877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC877 9740 bytes
SHA-256: 13b9df460d32dc8d67e5bc10b2c17da46638c13b63debc9eef0c562f1383cc29

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