Malicious PDF — malware analysis report

Static analysis result for SHA-256 858458c279f564d8…

MALICIOUS

PDF

74.4 KB Created: 2021-09-22 22:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e37f27958299a7ef88e5de096cfe1346 SHA-1: c09d386a4f652b53886df17b8581254d5972549d SHA-256: 858458c279f564d8501e8ad106002822d19bf1745a1eda452bf062218548eab9
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The ML classifier and PDF heuristics strongly indicate maliciousness. The document contains numerous embedded URLs, many of which are hosted on disposable domains or appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • 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://infrive.ru/uplcv?utm_term=madness+combat+unblocked+no+flash PDF link annotation
    • http://h-st.nl/bestanden/files/71577637605.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/48823694973.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4b1397ad1---85366580713.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/73725128006.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/nedijoritupap.pdfIn PDF document text
    • http://gotween.com/userfiles/file///60250604713.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/mazexizikakimasemetav.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/85303436384.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/soxawuwilozefitaxoveku.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/zanaranoxises.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/18361599651.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/vawikubapi.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/voxiwujorovu.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147ccb079a7c---13458897142.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/nejetatujof.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/suzamagileteguv.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/sudavikukas.pdfIn PDF document text
    • http://huiking.cn/uploads/file/191308213497.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/54684007184.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_off0000bdaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDAA 10876 bytes
SHA-256: 1346c6d2ceb7827aa369661472a48995123e26a89f1612f606cd9a718161256c
font_01_sfnt_off0000d6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eeb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB2 17652 bytes
SHA-256: 39fb6dc69d46a318945c864ce51a8278fadabf2212f4d273d1a84bd0e2d623d4

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