Malicious PDF — malware analysis report

Static analysis result for SHA-256 820ed2f8a9b905ff…

MALICIOUS

PDF

70.4 KB Created: 2021-09-24 16:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f88c996fbbe20b93ce9878c521b79f6b SHA-1: 9436c9ca0d4f77f6fc75e2a41fa742fb72006d1e SHA-256: 820ed2f8a9b905ff63f04f4dddac64b1042ac2a5a5565882a123d96761ff2039
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs pointing to external domains, suggesting a link farm or redirection mechanism to deliver malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, further supporting a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://synerhu.ru/uplcv?utm_term=examples+of+distance+and+displacement+in+physics PDF link annotation
    • http://coumert.com/images/file/75296225742.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/73189311399.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/61565313444.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/nopizo.pdfIn PDF document text
    • http://jljemc.com/upload/files/99053328457.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/dr589g1uuuou2pk7qivg7t4hi3/xidipumiponomiz.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/jodunetesapuz.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/ruxefanozepudunere.pdfIn PDF document text
    • https://blokhol.com/upload/files/ragibevamepus.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/49191730461.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/wutomozezuwef.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/jixusisezegijo.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/gakarinujesowavaxusize.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/73111282913.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/6131acd9c3c19.pdfIn PDF document text
    • https://proxus.nl/file/81944813386.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/883478695.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202109090601272240.pdfIn PDF document text
    • http://vaynhe.com/upload/files/vogisupobuba.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/59359471730.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/lovinenoro.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/51800001429.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/8d4c7ea34a5e43b13e76905d1f8d374f/dekukulexar.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/fukug.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_off0000af80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF80 17020 bytes
SHA-256: 8cb416e4fe3ea675df62b3589c9892ee30a85e32ecc82c47bc7c102fc913e375
font_01_sfnt_off0000da9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9A 10984 bytes
SHA-256: 9f6a2843beeda9b110d6c5cec3d868e807202a969f38fc3d1228f9b177f8d203
font_02_sfnt_off0000f3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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