Malicious PDF — malware analysis report

Static analysis result for SHA-256 78c970c686820afa…

MALICIOUS

PDF

80.1 KB Created: 2021-09-21 00:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5c956eba120489d39c5eb760675b3d78 SHA-1: 9cc9b6d7373d08e569e29c8170a0d75c9e64bfdf SHA-256: 78c970c686820afaa650058d62f0f68fd9721dc8b4bde2525a6c9935b21b68ba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are part of a link farm hosted on disposable domains, indicating a likely attempt to redirect users to malicious sites. The presence of embedded JavaScript, though not fully analyzed here, further supports the malicious intent of the document.

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://laborke.ru/uplcv?utm_term=pokemon+versions+gba PDF link annotation
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/70743242796.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6568092542.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/54679951917.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/josomazunuparerivujomaji.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/xunok.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/boxoxes.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/jelajosebulotig.pdfIn PDF document text
    • http://tulga.ru/editor/files/88633782795.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/linofuba.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/zugapiveruvesadedafunofe.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/metogofebezodumul.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/xaduxozejezalemejupe.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/gamimadosugazulif.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/webatogobulikuripepoxedom.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/17838005177.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/lusenipelupuvinaratis.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/gojokajixugisekuli.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/xiguzimawosomiperofulo.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/00ec94f198403b15a1285b12646911cb/45176328496.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/duxeladiwusokamaxex.pdfIn PDF document text
    • https://casadko.fr/userfiles/file/vawewesudivatul.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/totowovokimawopobexix.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148fd3c3a828---wubatakiji.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/23820095970.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_off0000cd57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD57 10604 bytes
SHA-256: d989c8027514add4bc9977043b903d94f58f0ddfae4f98e4ac7fca44f8f8d0ee
font_01_sfnt_off0000e59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB1 20424 bytes
SHA-256: 6add4958cfa143ef6662902f5c76a2f970aff0f5f0876e6efbca524c9d443737

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