Malicious PDF — malware analysis report

Static analysis result for SHA-256 79ba97574a7b7dd4…

MALICIOUS

PDF

84.9 KB Created: 2021-09-22 12:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 31743dc150bdcb385273f06a3331c163 SHA-1: c6c03c8d2e5e6a1c85e17873e2cdd3d504b9d613 SHA-256: 79ba97574a7b7dd453c7bb54a59b573ecd7febf00831100d580e27e64ba43afd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, strongly suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection further confirm its malicious nature. The file's structure and embedded links indicate it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://philabc.ru/uplcv?utm_term=wwe2k15+game+download+for+android PDF link annotation
    • http://sithome.com/upfiles/file/20210911102615.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/bepapoteg.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/jonugalupanadajule.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/40703397998.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/sezofuze.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lobigubez.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/vaduwawevibubifivutif.pdfIn PDF document text
    • http://neo-net.info/giganet/files/file/39989367467.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/52169582384.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/biguxa.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/12946531725.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/gonaruzagotodoni.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/welajaxokuzapoput.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/13574769219.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/minozofebejixozigux.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/nivogubexulotusevab.pdfIn PDF document text
    • http://vejwun.cz/images/1128123826.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae010c8dd2---sabojawiduwokusagog.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/dabenubene.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/poloratodasep.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/80385414047.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139f0778cf5c---binibamojazoguzeza.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/pizin.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/64878623841.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202191101115871.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/43865365859.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_off0000e606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE606 10908 bytes
SHA-256: 86ac187c25be04be5d74fdc111e35d7888fc0361cb7d27e732d361d2fca85cae
font_01_sfnt_off0000ff21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF21 17732 bytes
SHA-256: 22f5b58a25104393f0ea58dadbef3f5fe32a71063cde4728935df7467efccea7
font_02_sfnt_off00012d77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1