Malicious PDF — malware analysis report

Static analysis result for SHA-256 d96cab38d83d54fa…

MALICIOUS

PDF

69.6 KB Created: 2021-09-30 13:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4015b12c60ef18e8ed4b6a0951fdf5bb SHA-1: b5c40d02201e5f627925b73c8f801c73f378fd59 SHA-256: d96cab38d83d54faefcf40beffb8c9518daa7fb625153b08d81e4aaf055b46c5
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains an image-only facade with a clickable action that directs users to external URLs, such as 'https://pistant.ru/uplcv?utm_term=valerian+and+the+city+of+a+thousand+planets+full+movie+123movies'. The document structure and numerous embedded links suggest it is part of a link farm designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 69 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=valerian+and+the+city+of+a+thousand+planets+full+movie+123movies PDF link annotation
    • https://allmassage.net/upload/file/20210921170817.pdfIn PDF document text
    • http://irc.kz/data/content/file/wupuno.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109071854465694.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/18153424228.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/57729139721.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/jomomavaruwelijaganefiril.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/87660519699.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/78749404139.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/nudosuxofufijofu.pdfIn PDF document text
    • http://metzgerei-bischof.de/userfiles/file/51170199548.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/56579422920.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210914_114617.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/34524522595.pdfIn PDF document text
    • https://webmanagement.produse-electrice.ro/images/file/78704154639.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/zonadowiboni.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/63834128792.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/fedeva.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/wosetor.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/fewapowemasevakapor.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/op62dhvn27ov43qgoo46qeuob0/43403431710.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/gejopegotamodojuvute.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/97759468278.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/50450517484.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/vuvaxinusopapetofu.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_off0000b08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB08A 14456 bytes
SHA-256: 36ad8f96ef4c3f910d2e8ddbb622a022c53a3bed0516453e75cacb43a8261725
font_01_sfnt_off0000d4e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFD 11480 bytes
SHA-256: 73daf2e5398d8173cd2cbe690e63da3a0dd83455a7a3f19a56846ee09244e14e