Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c82f7dab40b807c…

MALICIOUS

PDF

68.4 KB Created: 2021-10-01 17:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 00818ce0589948b23f787f61a36c52d4 SHA-1: 2f6d99470a95f47d43705878c0fcadd3c9a5eca6 SHA-256: 7c82f7dab40b807cebdc81e532741d868942219f8a73db011e5b1b22ee88b8ee
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-heavy nature and the presence of clickable links leading to external websites. Heuristics indicate it's a typical shape for a phishing lure where a screenshot hides a clickable button. The ML classifier and ClamAV detection strongly support its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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=php+and+mysql+web+development+free+pdf PDF link annotation
    • http://itagqatar.zajeltel.com/itag/file/files/ruvoge.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109040944377616.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/zananizasonidusuju.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/bamanugakuluzerapapumod.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/vaxutifidafilabi.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1614b805ac7811---61660724262.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/dabunis.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210925005611.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/kexewi.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/41314973054.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/56943005985.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16143f7348c47f---xadepoj.pdfIn PDF document text
    • http://webbuilders.com/files/file/wibemewafutafipudop.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138028a9a4ad---41765399051.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/81714518181.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210914135349.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/benavasimuva.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/75729474213.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/41852880077.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/taxanubiwixaxafuf.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/welobafisifiloweridir.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/82894109316.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_off0000af0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF0B 11224 bytes
SHA-256: afa3b7e4da10ce0fe14f97b4999695a768e8982bb256d9ebec86b7b1a482a059
font_01_sfnt_off0000c8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E1 14028 bytes
SHA-256: 98d7c6b881b2c026c89b50162a9045cf2a033ae9ee0ba6355b50c323a77f3cec