Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b0017606a2c66a4…

MALICIOUS

PDF

90.0 KB Created: 2021-01-31 03:05:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 1ad83fa4fe4799ae4e79754ebae45b6d SHA-1: b47df61b6291e962454064e5e24c00e8ecf96d8c SHA-256: 5b0017606a2c66a4daa1c19308efbf02f71da6a515015c93135bbb3cbb3d8a1d
246 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ML classifier score and ClamAV detection for phishing and trojan activity. It impersonates Microsoft, a common tactic for credential phishing, and contains numerous links to external PDF files hosted on disposable domains, suggesting a link farm designed to obscure the ultimate malicious destination. The presence of embedded URLs and the overall structure strongly indicate an attempt to lure users into a phishing scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://tonavamajarow.weebly.com/uploads/1/3/4/6/134694337/zinovav-jedebutefipabij-kipozebelexob-mixisez.pdf.
  • 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://leonvi.ru/123?utm_term=windows+server+2012+security+guide+pdf PDF link annotation
    • https://cdn.sqhk.co/feguzuvubut/idgcnSy/48285219069.pdfIn PDF document text
    • https://cdn.sqhk.co/tinupolureg/Zjcd2ge/98205857862.pdfIn PDF document text
    • http://phrensy.co/cake_dowel_cutting_tool08i7c.pdfIn PDF document text
    • https://cdn.sqhk.co/xevowuto/iim6TdF/56406556399.pdfIn PDF document text
    • http://brumbum3.xyz/closest_smith_s_marketplace_to_mek5szf.pdfIn PDF document text
    • https://cdn.sqhk.co/jiguluzufuwa/VNjjxZP/41323255054.pdfIn PDF document text
    • https://cdn.sqhk.co/gawagunikuw/zP6idbW/8925704065.pdfIn PDF document text
    • https://cdn.sqhk.co/xogodapap/KghE5id/3915726656.pdfIn PDF document text
    • https://cdn.sqhk.co/kixobaza/qRgerjj/microsoft_teams_for_macbook.pdfIn PDF document text
    • https://tonavamajarow.weebly.com/uploads/1/3/4/6/134694337/zinovav-jedebutefipabij-kipozebelexob-mixisez.pdfIn PDF document text
    • https://cdn.sqhk.co/rubekafux/idiaijK/36764617754.pdfIn PDF document text
    • http://pasetbs.xyz/62572818779ouawk.pdfIn PDF document text
    • https://jubibesu.weebly.com/uploads/1/3/1/3/131379113/xekomivupegumaxir.pdfIn PDF document text
    • https://vekaforu.weebly.com/uploads/1/3/4/7/134747957/5983882.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxozowaki/jfV2AHy/photo_finish_horse_racing_mod_apk_download.pdfIn PDF document text
    • https://nemelodanunoju.weebly.com/uploads/1/3/0/8/130874480/mozoma_xewifisanokakox.pdfIn PDF document text
    • http://com-signto5.xyz/steven_universe_attack_the_light_game_download_freejpd8t.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/xulikamul/gluttony_gulch_grandma_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/resisuna/earth_science_textbook_9th_grade_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/hedgehog_care_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/application_x-_www-_form-_urlencoded_json_ajax.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/sapifivipi.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F51 5672 bytes
SHA-256: 58dba96f12a0910e00c7fc8b5f3bf1cf4492b1ecf815e7e33462f70d5557ab47
font_01_sfnt_off000132ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132EA 11492 bytes
SHA-256: 9d4227dce252412b983328e0ec4813f92c78c6154d1d0b56610dbc01b90067db

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