Malicious PDF — malware analysis report

Static analysis result for SHA-256 16e8a8f87a5a92fa…

MALICIOUS

PDF

75.3 KB Created: 2021-05-06 02:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7d772a279a8b988982c5db308d97d45c SHA-1: b7524575c34765434f6806c617be81026d02c141 SHA-256: 16e8a8f87a5a92fa26d27234ddade2d39d80a7a81fe8a5b7d5878a18f455feb8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9997

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://baarspo.ru/strik?utm_term=formato+de+solicitud+de+constancia+de+trabajo+word PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490365/normal_5fd814799beb8.pdfIn PDF document text
    • http://filmera.ru/xeforofaxad03lw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421957/normal_5fcd430d67196.pdfIn PDF document text
    • http://bupetud.xyz/148578496101jcza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413112/normal_601a5cf05a122.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494440/normal_605266d6d1dfe.pdfIn PDF document text
    • http://lolkek.xyz/dr_navneet_arora_iit_roorkee6fbrr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365541/normal_604a65c08d3c0.pdfIn PDF document text
    • http://faceit.su/get_free_shipping_on_everythingnilnp.pdfIn PDF document text
    • http://filemarker.store/35211419834v9bld.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420600/normal_60233963e8296.pdfIn PDF document text
    • http://verifybadgehelp.com/nonfiction_reading_passages_high_schoolzzblb.pdfIn PDF document text
    • http://freshremont.com/bet365_scores_apkqozgx.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/vutame/escuchar_la_biblia_hablada_en_espaol_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/latekuwidupukaledubub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af83edef-b0c5-4d50-a5c8-d748734e3cbf/percy_jackson_the_last_olympian_book_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e736bd00-76f4-4a0c-ae02-838229d56233/89571733383.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85202485-a742-4242-9d00-ae1719763d08/cunto_tiempo_se_tarda_en_llegar_un_ttulo_de_carro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1da32039-1d31-446d-8e5f-21da617f211d/iso_22000_training_malaysia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee245d5e-c51a-49a9-981e-04088e84a4ad/39028142595.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79B 5348 bytes
SHA-256: 43376e36b12f5d5ede1aba871b3fa7a4ced87180461edcd09d4e472955ca74ef
font_01_sfnt_off0000f9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C0 11696 bytes
SHA-256: fc4cf83fe970beb2fd96df891c827114e381f40627c46fdec15e3087f1d0aa5d

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