Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd3bb74d677e2c6a…

MALICIOUS

PDF

68.2 KB Created: 2021-10-01 11:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 2a3d2e3fdf9a00e19e8de64fc6676bfb SHA-1: e55b72dff23c0b79140ca4d397df03e7ffc5ae30 SHA-256: fd3bb74d677e2c6a13a490f185e2e4d8cf09c0d5640c16b8b67a033d0a216093
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only document designed as a lure, containing a clickable action trigger. Heuristics indicate it's a link farm on disposable hosting, and ClamAV detected it as Pdf.Phishing.Trojan. The primary IOC is a URL hosted on allytemp.ru, which is likely used to redirect the user to a malicious site for phishing or malware delivery.

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 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://allytemp.ru/uplcv?utm_term=wandavision+s01e01+putlocker PDF link annotation
    • https://hinaweb.com/upload/file/19863269090.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/12759734609.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109140456126082.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210901115347.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/pinitimedizemux.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/wivubuma.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/54500140679.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/rexosesamozaf.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/818825595.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/bosik.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/wakiwuwudu.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/xapitatomix.pdfIn PDF document text
    • http://ltpbetel.ro/userfiles/file/37127209778.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/73703566065.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/63635973273.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/jizesateveviwupometum.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/vevaxovuwuwufudomabe.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/binefokik.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/xapaluretovabebajirowimep.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/25637329347.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/pumuralazudomemumu.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/74781625445.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b63f9c67f2---guzozedewakenogimabage.pdfIn PDF document text
    • http://rilta.net/userfiles/files/kejogojoboxajexezumupu.pdfIn PDF document text
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/tabofitonegaf.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_off0000ae7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE7A 14200 bytes
SHA-256: 9d65c7eeeb6eefed65597b37c1956408bda9e8df69345883e642ec11762ffb75
font_01_sfnt_off0000d1fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FD 10932 bytes
SHA-256: b29c7a976842fb845f4385b32ee8117f4c112adbe07c0ac7267caf64f0898be9
font_02_sfnt_off0000eb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1