Malicious PDF — malware analysis report

Static analysis result for SHA-256 9db2d8dc410a84d2…

MALICIOUS

PDF

84.7 KB Created: 2021-04-05 15:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6b56f71ef67cb637ab73b2930ac8515c SHA-1: ab6c649dfc5b75781d9a4a6120c344bd74565a47 SHA-256: 9db2d8dc410a84d2d07fe0deae9f14dd72c021c03576d5c9d369c7f9a7f8aac9
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary URLs, 'https://nipisod.ru/wix?keyword=chapter+3+chemical+reactions+and+reaction+stoichiometry+answers', appears to be a malicious domain used for SEO spam or malware distribution. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://nipisod.ru/wix?keyword=chapter+3+chemical+reactions+and+reaction+stoichiometry+answers PDF link annotation
    • https://cdn.sqhk.co/fojufifef/iajft5P/tamil_dubbed_romantic_movies_in_tamilrockers.pdfIn PDF document text
    • https://cdn.sqhk.co/movozuba/gfJjdhj/fifawilipudazizazuxu.pdfIn PDF document text
    • https://cdn.sqhk.co/podizapexiv/cTgcz05/exothermic_and_endothermic_reactions_examples.pdfIn PDF document text
    • http://lotinawo.iblogger.org/bulova_marine_star_watch_battery_replacement.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2225f16e-b6a0-48e2-a067-d7e802b71dd4.filesusr.com/ugd/a7ada4_e62684ad6f784e1b91302ff5146bb294.pdf?index=trueIn PDF document text
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_a120a8e90ed54cbc86d58f5f1be0f7af.pdf?index=trueIn PDF document text
    • https://a52dd608-e7dd-4d50-8005-e0fd7a3896b4.filesusr.com/ugd/43d2fc_e205d4f1b4754d77bbacc0fa23e2358e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/64941365777.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/9019076140.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2813e73c-2a04-4905-825e-9ed594b922f0/19535324015.pdfIn PDF document text
    • http://vumopigaw.epizy.com/occupational_stress_inventory_questionnaire_free.pdfIn PDF document text
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_051160bf2de645a4845a8171c93e7f5a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/59151795218.pdfIn PDF document text
    • https://4465b75e-e642-4f53-8c89-e22f0b9d4994.filesusr.com/ugd/ecd213_df1b3a150f2b4949a0e51428c38f6b8d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/52389662390.pdfIn PDF document text
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_40fdf38b28744f8c8c6b29298718e810.pdf?index=trueIn PDF document text
    • http://risepaxazitomep.rf.gd/what_does_easy_street_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/divotofifajefelaxus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ec90508-cdd1-48bb-ace2-0b6e5c38bf4b/julajefenewesosuxevi.pdfIn PDF document text
    • https://5be7aec3-7d66-433b-ae1d-2bfb807ddf2a.filesusr.com/ugd/24deb6_01f46f5e915e4d3c9c2769ce8ec9bea2.pdf?index=trueIn PDF document text
    • http://pofitareku.rf.gd/76360898903.pdfIn PDF document text
    • http://sidakofonol.epizy.com/modul_sistem_pencernaan_manusia.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10931 5576 bytes
SHA-256: 4266e48eaa2a3030f9ff0bbdcdcc51b305ab9e1c64caef2adb654db33ca9f50e
font_01_sfnt_off00011c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0B 11936 bytes
SHA-256: 2cfed9676817c9de38d2c54c5a9cc7217e9a7af49533ff47f2f6f0abe56020b5

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