Malicious PDF — malware analysis report

Static analysis result for SHA-256 75fc4d4757814af3…

MALICIOUS

PDF

67.9 KB Created: 2021-09-26 22:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 764e727ba9ade3d63c60c83062d50f2d SHA-1: bfa87e00f60028d8bceddd846c0269068520f4f8 SHA-256: 75fc4d4757814af3bd97654da68952492a4ad42e176fd4ec4f9661df47cf5a22
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, being image-heavy with a clickable action to an external URL. Heuristics indicate it's part of a link farm hosted on disposable domains, suggesting a campaign to distribute malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are strongly indicative of malicious intent, likely leading to a phishing or malware download page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 67 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://smidgel.ru/uplcv?utm_term=can+i+install+android+on+a+pc PDF link annotation
    • https://ourcampuswindow.com/ckfinder/userfiles/files/91066462975.pdfIn PDF document text
    • http://babamoleskine.com/files/file/9374263740.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/tupoluduvixaras.pdfIn PDF document text
    • https://service-panev.com/userfiles/62641056167.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/gabimenuzeda.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/92606538908.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/penavax.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/nibexifekonuronuvagerit.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/51550167045.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/gazinokonexo.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/60732311832.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/88305870691.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/difatuvalexufi.pdfIn PDF document text
    • http://levotst.com/uploads/files/fojobofipumex.pdfIn PDF document text
    • https://bliznacite.dvsportbg.com/files/42874952780.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/33284077976.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/50311045927.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/fiwukemetakukekepaxebala.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/cd37rik2k04jn0r1h072fhlidv/21205327925.pdfIn PDF document text
    • https://discovery99.com/userfiles/file/relupakezepubonegibaz.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b18a7cd4a4---bidip.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210914_B072E131829DE46B.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/lipus.pdfIn PDF document text
    • https://securitydm.net/slicice/file/xuxajuxifalufoda.pdfIn PDF document text
    • https://didaktika.drmix.cz/uploads/files/tafif.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_off0000aff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF0 10408 bytes
SHA-256: 2a5bf421a94df000174ff30cfdf38035cc7e9d11fa4929d1582c774581534492
font_01_sfnt_off0000c79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dfb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB1 13924 bytes
SHA-256: ee244a123c35d5da9c8283a8c2a9f03b6925e9e085e8889998e44191bd59ee54