Malicious PDF — malware analysis report

Static analysis result for SHA-256 0254b6a0d5418aea…

MALICIOUS

PDF

67.1 KB Created: 2021-09-27 23:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 192e6af23eb0c0750cbf5ead2fcaaa29 SHA-1: 7df53f40fedbfd87b893349942c19483b0025c7c SHA-256: 0254b6a0d5418aea6b0b1b35c6805f782570c7f9adc47e4927e0dc4e63812f72
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs an image-only lure, a common phishing tactic to trick users into clicking embedded links. Heuristics indicate it functions as a link farm on disposable hosting, directing users to various PDF files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://hy-sf.com/admin/upimg/file///4869624361.pdf In PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/zadowisejebaxa.pdfIn PDF document text
    • http://image.dlib.vn/libedu/news/bvu/20210921/file/nopulubegowurimet.pdfIn PDF document text
    • http://entrackintl.com/uploads/91866593846.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/95999302356.pdfIn PDF document text
    • https://brakos.it/file/kamavup.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/4853166364.pdfIn PDF document text
    • https://natinsel.com/imagenes/file/sidowoloxukuledadomi.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/wajedamowabazagaginadu.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8252632955.pdfIn PDF document text
    • http://aven.su/userfiles/file/48485324426.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/29104439353.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/gujevitizez.pdfIn PDF document text
    • http://agilesolutions.in/uploads/69882516940.pdfIn PDF document text
    • http://ave-france.com/pics/files/niwufibokarodisazorig.pdfIn PDF document text
    • https://costarica4d.com/contents/files/1979414429.pdfIn PDF document text
    • https://webmanagement.jbclub.ro/images/file/23549901565.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/xerawadekibomonabato.pdfIn PDF document text
    • https://kudusde.org/resimler/files/39570083369.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/29543800693.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/77907304875.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/nepowolegu.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/81009606072.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=best+pubg+ipad+playersPDF link annotation
    • 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_off0000ac44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC456 13940 bytes
SHA-256: d53f87599a0f5693c1181c3fcbc0d99f8fdd3423fce9cceeff04635352ddf952
font_02_sfnt_off0000e6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D7 10752 bytes
SHA-256: 7b482876af355fe239f5c697a09dbc5e7540a2b9747cfd5158e4f590a1a49757