Malicious PDF — malware analysis report

Static analysis result for SHA-256 41b1bc165eb6bfdf…

MALICIOUS

PDF

79.1 KB Created: 2021-04-01 23:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 7b89b64134fd82500b3290f5b53dbc5e SHA-1: aa6c122c0f86ebb49f360cd323caa6411b2c05fe SHA-256: 41b1bc165eb6bfdf116e4645bd23bdc199402c2cb2ff5540aa3853c2f59b9bc7
164 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains a mass of external PDF links, many of which are SEO-focused. One of the external links, 'https://resalured.ru/award?keyword=exercise+of+abstract+noun+pdf', is directly associated with the PDF's content and likely serves as a lure. The presence of a 'download button' heuristic further supports a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://resalured.ru/award?keyword=exercise+of+abstract+noun+pdf PDF link annotation
    • https://nudareniwode.weebly.com/uploads/1/3/1/8/131856427/kejimekegusaler_puxuwu_buzos.pdfIn PDF document text
    • http://vaxisezawoged.scienceontheweb.net/pezebirozafofixiwixewizig.pdfIn PDF document text
    • https://jematujevuzonip.weebly.com/uploads/1/3/4/2/134235480/57a827a0.pdfIn PDF document text
    • https://xikudamoxi.weebly.com/uploads/1/3/4/5/134576601/47597e81abc4.pdfIn PDF document text
    • http://xajavawinereko.mywebcommunity.org/xajasag.pdfIn PDF document text
    • http://pazefezos.mywebcommunity.org/gojexapixusezas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lazolu/power_bi_slicer_filter_whole_report.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/47173746144.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/54604994810.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/25773246956.pdfIn PDF document text
    • https://s3.amazonaws.com/jizubisetebof/dunkin_donuts_egg_white_wake_up_wrap_nutrition_facts.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/fitbit_charge_hr_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/68240657921.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/wings_of_fire_the_dragonet_prophecy_audiobook.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/79929135297.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/angular_version_upgrade_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/asphalt_racing_game_for_java.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/romebixobujiwexoga.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/how_to_waterproof_cricut_printable_vinyl.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/72596935200.pdfIn PDF document text
    • https://s3.amazonaws.com/getizar/seating_chart_for_blumenthal_performing_arts_center.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE486 5280 bytes
SHA-256: 6e271b15420c49c1bba695f78394996043177b9e75424ca00d642020027799df
font_01_sfnt_off0000f68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68C 10468 bytes
SHA-256: d938ed36605581a52e803d363cea85ad6c2f12a6a2eec490dff5688494c76776
font_02_sfnt_off00011a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A59 16076 bytes
SHA-256: daf1883492d64eb2830cc8eabcc582def4ae9ce6a05fcd400af63bb13c14892d

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