Malicious PDF — malware analysis report

Static analysis result for SHA-256 122bec228e1cee6c…

MALICIOUS

PDF

80.0 KB Created: 2021-09-13 03:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ee8c7c46ba88efa878ffa584f190d760 SHA-1: 3749f6cbd5cfa13ddbdbd9d71d818c114cc0b23b SHA-256: 122bec228e1cee6c446a029643cea34b2a54de28e7a5ff93f31506726632d8ce
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are likely used for redirection to malicious sites or for hosting further payloads. The PDF structure and embedded URIs suggest an attempt to lure users to external resources, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pistant.ru/uplcv?utm_term=sync+sms+to+gmail+android PDF link annotation
    • http://studionegro.net/userfiles/files/jovavi.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/nowipabofoseme.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210908151841.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/13850942585.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/14591103503.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210907034814.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/41924509667.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/pawexasuvixexosareriziku.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/zuzevekazawilen.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/kabiloj.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/jibugaz.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/dafiparefawuwi.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/161371686284d3---6280982378.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612efb4ed71dc---levaxavugudewoj.pdfIn PDF document text
    • http://mextro.de/upload/files/73976374928.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/vibopipok.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/64799614519.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/vilosarupobobuta.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/18959247223.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/402120522.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/10870211933.pdfIn PDF document text
    • https://petek.biz/resimler/files/nizilipokupudurezuz.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/bizivuwogurofud.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/tupuvigomajelebamasepaxar.pdfIn PDF document text
    • https://unimedbelem.com.br/painel_template/assets/global/plugins/ckfinder/userfilesfiles/68631292296.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://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_off0000d68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA6 10772 bytes
SHA-256: 24dd387c889755de852b4cc73335124c678acb834a7dec12a0768d7ea2f0a916
font_02_sfnt_off00010731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10731 16648 bytes
SHA-256: da60a0f078cb940063723711d7c378afafd21123ea8e07eb8dfe767ee7677b46

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