Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa73fa3875a6025d…

MALICIOUS

PDF

68.3 KB Created: 2021-04-04 09:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 725b7ae4b324dfaa18808932a3f6210f SHA-1: 507c3c8f20c57cb8185a0e8c0f7ebd7a33b93bea SHA-256: aa73fa3875a6025d26147fb8a350c82cc45bdba730edacc9db5e70e7092c4f75
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/wix?keyword=chemistry+concepts+and+applications+chapter+6+study+guide+answers PDF link annotation
    • https://cdn.sqhk.co/jarebomu/ibaYham/causes_of_world_war_1_main_worksheet.pdfIn PDF document text
    • http://pejokepi.mywebcommunity.org/gods_way_to_ultimate_health_ebook.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/5191961260.pdfIn PDF document text
    • https://cdn.sqhk.co/fugutexifi/0ggjgIm/63128367579.pdfIn PDF document text
    • https://pebabole.weebly.com/uploads/1/3/4/6/134698512/9596637.pdfIn PDF document text
    • https://disovipogazita.weebly.com/uploads/1/3/1/3/131398104/mibapurevedolaw-melesutimosej-liwazarivudemef.pdfIn PDF document text
    • https://cdn.sqhk.co/madufuxenuw/je3Khd5/fanivatuxom.pdfIn PDF document text
    • https://bexajaruxomape.weebly.com/uploads/1/3/1/3/131384789/1876172.pdfIn PDF document text
    • http://firobazotu.sportsontheweb.net/18359097524.pdfIn PDF document text
    • https://dekodisiga.weebly.com/uploads/1/3/6/0/136051758/webagapedidu_zesidut.pdfIn PDF document text
    • https://cdn.sqhk.co/xejadukoxeta/O0jjXii/photo_studio_rental.pdfIn PDF document text
    • https://cdn.sqhk.co/wujakegu/mphaibR/jaxitebokagikabobaxike.pdfIn PDF document text
    • https://dafizoxov.weebly.com/uploads/1/3/5/3/135309439/duvakeje.pdfIn PDF document text
    • http://serarudipiwuvon.mypressonline.com/51621638563.pdfIn PDF document text
    • http://kogutojoveso.mywebcommunity.org/free_certificate_of_completion.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/gavapozalilup/can_i_find_my_old_sat_scores_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/676a9b18-4a2b-4a6b-b3f2-1d727a905dcb/36050963475.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/puzewofarozewasibe.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/57885138669.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/newogesana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3113acd9-0c94-4b77-8842-542cdc9b7d37/41105867139.pdfIn PDF document text
    • https://s3.amazonaws.com/gogunabones/tu_aashiqui_title_song_ming.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_off0000cc54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC54 5740 bytes
SHA-256: 88eba2c6ccba177f848c69dd82a0a5ff741b89089b74a03d6e23e21cfc07c1c8
font_01_sfnt_off0000dfc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC9 10380 bytes
SHA-256: 8081ce2adcbc33a5f823e93f2b506cc112035157d70e2854797f00241c89f094

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