Malicious PDF — malware analysis report

Static analysis result for SHA-256 7510073fd4c7efab…

MALICIOUS

PDF

83.2 KB Created: 2021-04-21 02:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e81858536499ee670be97d4a069b1150 SHA-1: b10dfc71e1408313077b6441fb7550a6c196e93a SHA-256: 7510073fd4c7efab703da36af2214a4ed4122514a4d782906d0c9e9e5b33fd63
156 Risk Score

Malware Insights

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

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 0.9991

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 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.
  • 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://vilenefex.ru/strik?utm_term=computational+fluid+dynamics+course PDF link annotation
    • http://boxijogirexu.medianewsonline.com/11576870212.pdfIn PDF document text
    • http://sufofure.mywebcommunity.org/ancient_alexandria.pdfIn PDF document text
    • http://findattime.com/53456571284qiwtg.pdfIn PDF document text
    • http://datingdate.site/pdf_introduccion_al_estudio_del_dere24o62.pdfIn PDF document text
    • http://wojesukuzak.mygamesonline.org/gujarat_building_bye_laws.pdfIn PDF document text
    • http://hotsales-com.xyz/nevedulunuct7e2.pdfIn PDF document text
    • https://nebenumepidenok.weebly.com/uploads/1/3/5/3/135307723/tofaserix.pdfIn PDF document text
    • https://nojinogexosop.weebly.com/uploads/1/3/4/6/134695112/fobefuxovev.pdfIn PDF document text
    • http://regvoolkim.website/43783011685kr3xd.pdfIn PDF document text
    • http://fumexijana.getenjoyment.net/pilulegaw.pdfIn PDF document text
    • https://viwekaxirudadax.weebly.com/uploads/1/3/4/7/134700275/nizukuxejejetapux.pdfIn PDF document text
    • https://ferofetilusef.weebly.com/uploads/1/3/5/3/135346026/vufuzuris.pdfIn PDF document text
    • http://bomaduworofa.medianewsonline.com/lugunenutadejoge.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/golepe/vuzakife.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/and_install_appium_desktop_client.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/44488693871.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/32225598686.pdfIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/45817560742.pdfIn PDF document text
    • http://juludiripo.myartsonline.com/irregular_plural_nouns_worksheet_3rd_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/zonuvawitazofoz.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/xolulalemaxoromefedolofar.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/how_many_ex_lovers_is_too_many.pdfIn PDF document text
    • http://masemipeba.myartsonline.com/97489139893.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_off0000ef9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9C 5308 bytes
SHA-256: adab29d7ded26d8a3081ad971f263094e4ea732bfcb152a29f28139bab86a8fa
font_01_sfnt_off0001019d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019D 11656 bytes
SHA-256: a0d7de9645b076a4e3da74e42359b5807d27164ae67857e344ca22400a1ee965
font_02_sfnt_off00012971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12971 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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