Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8670dfa524efc18…

MALICIOUS

PDF

80.2 KB Created: 2021-09-21 20:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 45782c0e012bc15377e86882bb5e7ba1 SHA-1: 3925834d6fb93a406190e371236d49e95ecea298 SHA-256: d8670dfa524efc18edf0282ed1ce30dcbaa74f0b3fd7e49616687787aad58005
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The primary purpose seems to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crysiq.ru/uplcv?utm_term=spy+mobile+apk PDF link annotation
    • http://lnhaihui.com/userfiles/file/20210907021926_1778459300.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/xegibiporakavufowijotadu.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/70099868945.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/xarirozofiloluz.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/jububi.pdfIn PDF document text
    • http://17njl.com/userfiles/files/jetufukuxa.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/jofemunoboxezonixuk.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/36478769950.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/pusamikajerarapakikefobet.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/fafonofefu.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/72620305572.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/28470559685.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/lawuxunubakajoxar.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/67383891581.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/15907973758.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/80872556143.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/58118478872.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/21415411789.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/bapikusagukawelu.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/nemerowalajosiraj.pdfIn PDF document text
    • https://bdata.vn/upload/files/dilenujafezijuwam.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/zunulekezakovudixaw.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/161449dcfc5807---26067565865.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/4t5gu3jkvumqd41sgqkt87pq62/14018614377.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_off0000d629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD629 17724 bytes
SHA-256: 0aa3da18c2a7da932f0aeefa0a1310c3757f149bc575854e89c74c649f566bac
font_01_sfnt_off0001046e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C85 10364 bytes
SHA-256: 426d20e2f22f910ecf5dc91da129b526f662d525452f93c1c2f3a84df226d816

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