Malicious PDF — malware analysis report

Static analysis result for SHA-256 a73f9f4610cba6cb…

MALICIOUS

PDF

80.8 KB Created: 2021-03-29 22:40:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3141029fc17bdf1fda3f71390f09a5b0 SHA-1: 57893fa94137c2a0bea52dfa4ccb9127093bf040 SHA-256: a73f9f4610cba6cbf48efd2a0c51e488a069c9d49698d71fab90414a84ad8f4d
104 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://crophysi.ru/award?keyword=treatment+of+malignant+hypertension+pdf PDF link annotation
    • https://cdn.sqhk.co/ledirevobep/jxBjdid/nebulous._io_game_online.pdfIn PDF document text
    • https://cdn.sqhk.co/visukodo/WSjH2cu/79699391608.pdfIn PDF document text
    • https://cdn.sqhk.co/nupepewomaxu/iisKggz/pinball_battlers_for_sale.pdfIn PDF document text
    • http://jagofililopimum.22web.org/matura_podstawowa_angielski_gramatyka.pdfIn PDF document text
    • https://penuwepilaxol.weebly.com/uploads/1/3/4/7/134756509/0d28def97735.pdfIn PDF document text
    • https://gefivogixofix.weebly.com/uploads/1/3/0/9/130969648/rizuxifa-nozagoxazubip-nonasuvoreguk.pdfIn PDF document text
    • https://getaforufuzok.weebly.com/uploads/1/3/4/7/134733873/5935240.pdfIn PDF document text
    • https://kitupiver.weebly.com/uploads/1/3/4/4/134446404/zugakavatexa.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/bipepezuwed/47170405111.pdfIn PDF document text
    • https://s3.amazonaws.com/janodojivi/norajalog.pdfIn PDF document text
    • http://jujonejetas.epizy.com/51199256411.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/peter_and_wendy_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/lorum.pdfIn PDF document text
    • https://s3.amazonaws.com/tulosa/minujoleposopoxadogaxuban.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/xenis.pdfIn PDF document text
    • https://1f571a09-6495-4108-bd1a-9715deae29b5.filesusr.com/ugd/b0bf26_c07cc3a1c5c04643ae90d5a562d5f037.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/liwafo/lafuw.pdfIn PDF document text
    • http://desasivitusuzux.epizy.com/tell_me_about_yourself_interview_answers.pdfIn PDF document text
    • http://dofumuligo.rf.gd/5439293075.pdfIn PDF document text
    • https://f55c6975-0091-4942-a106-dc80285e5f9d.filesusr.com/ugd/8a4248_f2d70972c7a0451ba73088dab77431fa.pdf?index=trueIn PDF document text
    • https://c83cbd6e-a134-4b49-ba12-49f24c654ad9.filesusr.com/ugd/904a8b_3228690d51324e2f97e7232fb5e1cda3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xeroguru/zizen.pdfIn PDF document text
    • http://rapabilalame.rf.gd/astron_power_supply_circuit.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/hernia_hiatal_tratamiento_quirurgico.pdfIn PDF document text
    • https://s3.amazonaws.com/fasudikek/rerixobipufifemifokesot.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_off0000fdd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD7 5504 bytes
SHA-256: 6b9c4a4af62b131b845f544cad9faed6fc621b95ecd23e7aeeac9201442d8f9c
font_01_sfnt_off0001106e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106E 10812 bytes
SHA-256: 6ae2bfe004602bced33c49fd7ecaa00b1166795f040f6669813022659ac874e8

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