Malicious PDF — malware analysis report

Static analysis result for SHA-256 76aa5fed63ad06df…

MALICIOUS

PDF

82.7 KB Created: 2021-10-07 11:31:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 23e3f7afad3727abed00370d8d5c7e68 SHA-1: 6c4ced9f42bdd3bfa030be1f17748d67adbf7516 SHA-256: 76aa5fed63ad06dfb81120bda47ebd39671c9b5059a82d1957c7a1cecfb6883b
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded URLs, many of which point to disposable hosting and are structured as link farms, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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=how+to+have+twins+naturally PDF link annotation
    • http://sochi-riba.ru/ckfinder/userfiles/files/48392664010.pdfIn PDF document text
    • http://curvesncontours.com/userfiles/file/38916279102.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/figebodedilizobajebozu.pdfIn PDF document text
    • http://aawyx.com/sites/default/imageuser/file/gewagabipoli.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/fuvaxonunuvaguzutinopujas.pdfIn PDF document text
    • http://sissonne.hu/editor_up/dutubobuzejininun.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/37983193534.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021092103041333.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/solidudisasedeko.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/19069668554.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/wikurutomosatubesevirana.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/sakixata.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/kotegesepedomikogo.pdfIn PDF document text
    • https://www.netcorp.hu/data/editorfile/wanuranuv.pdfIn PDF document text
    • http://scro.ru/pic/file/48532494790.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/noliruniwasil.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16138c7a9b00e6---xavobutejabukosuzomawap.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/159161153961369a72325af.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/93240789835.pdfIn PDF document text
    • http://motopujcovnateplice.cz/userfiles/file/78985721289.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161586398b41af---79056139794.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/mubafegomagotedifav.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/13170599400.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/57136946173.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_off0000dca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA4 10560 bytes
SHA-256: 0c7a85735bebb73ba0ff4c9ac2318d8fa8e1d6b31575a6108ce8d672b3a19b7b
font_01_sfnt_off0000f4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BC 18544 bytes
SHA-256: 9ba695c558f57a877e8dcc644c7499c891e0e9ef066d70296ce347e3c597dc06
font_02_sfnt_off00012546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12546 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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