Malicious PDF — malware analysis report

Static analysis result for SHA-256 83f42b733c5aabeb…

MALICIOUS

PDF

75.1 KB Created: 2021-03-31 02:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: c464552b82103f06af2f8f159a377624 SHA-1: bfe037d236ce482dcadcd8e1d55add95a1dd6c73 SHA-256: 83f42b733c5aabeb17a3ec563d4e67297a96115b8328f5698e34e5801552c230
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using link farms on disposable hosting, suggesting an attempt to drive traffic to potentially malicious sites. While no scripts were explicitly extracted, the presence of many external URIs and the ML detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/award?keyword=variance+and+standard+deviation+formula+pdf PDF link annotation
    • http://fujigukatujewu.medianewsonline.com/xijasubin.pdfIn PDF document text
    • https://cdn.sqhk.co/rutesawir/cTN2thj/carries_war.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/w2EhfSZ/22213227839.pdfIn PDF document text
    • http://rujitexoxobag.mypressonline.com/biological_molecules_pogil.pdfIn PDF document text
    • https://cdn.sqhk.co/zikufivol/hgjgi6b/kubavaxi.pdfIn PDF document text
    • http://tagoturuluro.medianewsonline.com/ninufodenasog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fixararololu/99980322205.pdfIn PDF document text
    • http://sakonolib.rf.gd/jexagibuforajugeb.pdfIn PDF document text
    • http://nupozefujelo.epizy.com/free_whatsapp_messenger_for_windows_10.pdfIn PDF document text
    • https://71f68c9c-1037-483c-a0ca-f268b7ddd3c8.filesusr.com/ugd/87fdc7_b364c56b1f234f88847a497e4ba611da.pdf?index=trueIn PDF document text
    • http://faxanudof.epizy.com/80571680263.pdfIn PDF document text
    • https://s3.amazonaws.com/taturi/favimopavaxeravafutuzow.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/ramujasefubolesowiraxomi.pdfIn PDF document text
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_8fb8b6d1c1514bcc97f01ced13dcca4c.pdf?index=trueIn PDF document text
    • http://jigiwema.epizy.com/bodyboss_ultimate_body.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/puruza.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/bestwap_love_ringtone.pdfIn PDF document text
    • http://tufubumokagefe.rf.gd/azure_equivalent_to_cloudformation.pdfIn PDF document text
    • http://rukosivujuxu.atwebpages.com/workforce_tile_cutter_thd550_owners_manual.pdfIn PDF document text
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_5a53707cb1214a8e944b2e92e4b371c1.pdf?index=trueIn PDF document text
    • https://c81c1a69-aec6-471c-ac34-7a6800eafc69.filesusr.com/ugd/9ef1ea_e267e575dce24bb3ba6c00558f99be28.pdf?index=trueIn 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_off0000e70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70A 5328 bytes
SHA-256: b6dcc8779c7b8469585628344bd2afb570fd544af72eb67f1db7be97462f51ee
font_01_sfnt_off0000f91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91D 11112 bytes
SHA-256: 6feba584f1533e5e52cabc16cd1be028bdd6481ad0a5e0b22ec34f8bf8051476

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