Malicious PDF — malware analysis report

Static analysis result for SHA-256 892bbecbc84ab3b1…

MALICIOUS

PDF

68.9 KB Created: 2021-09-16 08:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5bf0ac975a45f01a811b62a4938f5584 SHA-1: 77be96041d6ba42ce8aa3d3c841483960d6211da SHA-256: 892bbecbc84ab3b169193a068bbf5cfeaecd1b70c355bf0d3619ac6d3dd798c6
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV. The 'PDF_IMAGE_LURE' heuristic indicates it is an image-only document with a click-outward action, typical of phishing lures. The presence of numerous external URIs, many pointing to potentially disposable hosting, suggests it is part of a link farm designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://viethanit.vn/hinhanh/file/sagimolopopawan.pdf In PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136546512f24---35926279566.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/940e83442ca6c9172d3b1025f2167907/79083808236.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/kovefezun.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/61731816853.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/tafekipafu.pdfIn PDF document text
    • http://ratchee.com/ckfinder/userfiles/files/91334980711.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/viwuzepif.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/patojumobalufuj.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/derobofitivizanefivata.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/sositibivulol.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/tovodem.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/zoragowuzadi.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/xowugagakojalukejoxaga.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/veditaxasu.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/41299074976.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/54252708658.pdfIn PDF document text
    • http://vidol.eu/userfiles/file/jijapu.pdfIn PDF document text
    • https://granitnet.hu/editor_up/19457425860.pdfIn PDF document text
    • http://landpas.pl/upload/file/wipojelotivudexavi.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/lirituzewapovaji.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/zifepufumemirev.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/96489966050.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=scaricare+i+video+da+youtube+con+androidPDF 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_off0000b264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB264 14140 bytes
SHA-256: f7849a2362e41df685b8f2e3528720bd9e95c5eb6f725e45c49289267f15b640
font_01_sfnt_off0000d556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD556 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6D 10644 bytes
SHA-256: b3cc72dcfb6a9f5485d99e2356c78c63df73a5f26276e4a171aac2bc40322858