Malicious PDF — malware analysis report

Static analysis result for SHA-256 c196d93145d645f3…

MALICIOUS

PDF

132.1 KB Created: 2021-03-30 13:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 63a2d2d696f6e442643c2bf17ddd5ad8 SHA-1: 7c726550629ce0ed5582512a16a03c922ab160e1 SHA-256: c196d93145d645f3c1c7ce2a7c865015eb536ca5256fd1897ea5896d24d2608a
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 SEO-optimized to appear as legitimate search results for various topics. The primary URL, 'https://botokaw.ru/award?keyword=calculus+10e+ap+edition+pdf', suggests a phishing or link-farming scheme. ClamAV detection and ML classification further support its malicious nature, indicating it is likely a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/award?keyword=calculus+10e+ap+edition+pdf
    • https://cdn.sqhk.co/wofikubid/enPicjc/school_girl_simulator_mod_apk_rexdl.pdf
    • http://metiwizonud.getenjoyment.net/55629577573.pdf
    • http://telupizevos.iblogger.org/sociologija_religije_ivan_cvitkovic.pdf
    • http://lodomujimujug.mywebcommunity.org/mewuwulofiga.pdf
    • https://cdn.sqhk.co/lepezusija/ggygehf/street_fighter_v_apk_game.pdf
    • https://xorukulimuz.weebly.com/uploads/1/3/4/7/134728044/resiwuxidodekejuwuv.pdf
    • https://cdn.sqhk.co/dodalowogiv/6jbIjcA/denzel_washington_airplane_movie_trailer.pdf
    • https://cdn.sqhk.co/xawobovuji/ja43vid/50544506518.pdf
    • https://wifojulov.weebly.com/uploads/1/3/1/4/131438113/fubezofinudegasojowe.pdf
    • https://bukodebavuv.weebly.com/uploads/1/3/4/6/134657655/1134688.pdf
    • https://vipukawolatu.weebly.com/uploads/1/3/4/4/134486161/saveva.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vibuvomomuv/how_to_get_my_real_estate_license_in_michigan.pdf
    • http://bazokupakem.epizy.com/anet_a8_power_supply_upgrade.pdf
    • https://s3.amazonaws.com/wizitifowubux/tafosujo.pdf
    • https://s3.amazonaws.com/wofaxil/love_poems_for_her_short_and_sweet_long_distance.pdf
    • https://s3.amazonaws.com/jedadokuti/where_do_math_symbols_come_from_-_john_david_walters.pdf
    • https://s3.amazonaws.com/xuzakob/wonomiwufugizunobivufi.pdf
    • http://pamixawikisif.epizy.com/26127495416.pdf
    • http://tokafibalo.epizy.com/irregular_polygon_angles_worksheet.pdf
    • https://s3.amazonaws.com/kodipopujufipig/weight_loss_veg_diet_chart.pdf
    • https://s3.amazonaws.com/wibedubosateg/82739342255.pdf
    • https://s3.amazonaws.com/rebesudanolo/kwikset_910_reset_code.pdf
    • https://s3.amazonaws.com/julaxel/what_is_a_limited_term_drivers_license_in_texas.pdf
    • http://sipanokule.onlinewebshop.net/vetazavijenisoxemuk.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_off0001cc62.bin
29ce471d0f734583f7d2f0fc4a3a23c90ec13bea8c0cd78457b7f8fe2014bcc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC62 5152 bytes
font_01_sfnt_off0001de00.bin
8563629ffdc36ade313ac135aa3d3798700edff2ec8abfade6936e2c6589063b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1DE00 10780 bytes

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