Malicious PDF — malware analysis report

Static analysis result for SHA-256 878c494a5f983da2…

MALICIOUS

PDF

80.4 KB Created: 2021-09-12 18:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 81b64a5baf23729718204f8eb1781590 SHA-1: 8505dedd7e083d94588888ea3da5bb04945be330 SHA-256: 878c494a5f983da20a87181e09038ca42088107eecb1739aa29d32adccc8c4bb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://hijaustabilo.com/contents/files/jidarelenumuvenow.pdf In PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/9fad9a5305fbe1c023bef52c2d1f0933/68243943502.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/3296759295.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/sufarewifolosubimovi.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/55439411167.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/81595508645.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/bogizisizuja.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/rijojuguromafilitonodavor.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/pazorevubenozufufepamoba.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/49856298616.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/nuluzutezigafujopigiwikor.pdfIn PDF document text
    • https://penzion-palice.cz/content/pibabivulinagovilixisudew.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/35777844031.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/25360542851.pdfIn PDF document text
    • https://ivanamihic.com/files/vadifitalizutajozagotuz.pdfIn PDF document text
    • http://telecycling.org/files/file/60516501368.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/sososokir.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/nelikaragetizef.pdfIn PDF document text
    • https://breedlife.com/upload/files/69728182839.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/11503045139.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1612fe0053ce58---sebujaxe.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/janutanejefi.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/tupalikodigotojekexima.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=redmi+note+10+cpuPDF 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_off0000c9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E7 22532 bytes
SHA-256: e8e23de014389d2f33fe450a3eca1e8f794bd7d089dda89271bffc080b7b665e
font_01_sfnt_off000104c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDA 10516 bytes
SHA-256: 5db52c17e9f98647782f9b7c7a80178747b21f51e727b79f5f05d125a7565f45

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