Malicious PDF — malware analysis report

Static analysis result for SHA-256 162596ef2e408b34…

MALICIOUS

PDF

80.4 KB Created: 2021-09-09 06:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cf60dca634b1c425b3e2961c162272aa SHA-1: 6691e71e37a3aa2485554db4c054baca0356331a SHA-256: 162596ef2e408b34a7bb656a67ec1db6bc939b0d93f7d7e3d41928acd8012646
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and form a link farm, indicating a likely attempt to redirect users to malicious sites. The presence of external URIs and the overall structure suggest this PDF is intended to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://donkaew-furniture.com/ckfinder/userfiles/files/67222358891.pdf In PDF document text
    • http://landia-print.com/pdir/file/naliwakojalagunuxasomesan.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vadolejex.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/buvotuge.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/24547152005.pdfIn PDF document text
    • http://cuacuonbinhduong.com/upload/files/46237461327.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/gewubodigifubixupokava.pdfIn PDF document text
    • http://airsoft1.ro/files/file/gefojama.pdfIn PDF document text
    • http://vinmexindia.com/uploads/19670878047.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/21047830807.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109071808215686.pdfIn PDF document text
    • https://xinpayflow.com/ckfinder/userfiles/files/nubavibaxal.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/74926300798.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/zaxajekijazopotokimunekos.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/vemuz.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kokomuvorovipivoji.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/93875531089.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/85093984817.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/93021507598.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/24346414296.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/piguviwawif.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/96315280091.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/kapalaku.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/45374020529.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=maps+gratis+para+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_off0000d673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD673 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE85 17204 bytes
SHA-256: 1bdef58993e44c2253b0398fb9d541c4ae46f5809a209e5f6e05f18ecbcb5439
font_02_sfnt_off00011b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B14 10380 bytes
SHA-256: 0ba5dec7672e0654ec8cd5606695001e1f20ca10e8072879c6b5c78dca45193c

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