Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca5d1899959b4b74…

MALICIOUS

PDF

76.5 KB Created: 2021-05-23 16:43:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 01fe53f9d23797f0c3a2af176a19fcbe SHA-1: c9bec7fd31f110ff534654087ebfc408acd88d21 SHA-256: ca5d1899959b4b74f7371c4bed69d4fed5848294866f1fc68d12804e2fb49f12
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many of which point to SEO redirectors designed to lure users into downloading files. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_UTM_REDIRECTOR_LINK indicate a deliberate attempt to create a link farm for malicious purposes. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://gimoguvi.ru/strik?utm_term=libro+de+matematicas+segundo+grado+de+secundaria+2019+pdf PDF link annotation
    • https://kexazupaxi.weebly.com/uploads/1/3/3/9/133997339/7428636.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387567/normal_605ba1b2a2b65.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426073/normal_5fed3fc9ec708.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456666/normal_603ebbc3bab4c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443329/normal_5fcb72a1d28f4.pdfIn PDF document text
    • https://sezowizubuv.weebly.com/uploads/1/3/0/8/130874308/e3e5ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488130/normal_605389821153e.pdfIn PDF document text
    • https://ninujesifig.weebly.com/uploads/1/3/1/4/131453022/7825438.pdfIn PDF document text
    • https://gigufeti.weebly.com/uploads/1/3/4/6/134633464/keparodixil.pdfIn PDF document text
    • https://pizizidoto.weebly.com/uploads/1/3/0/8/130873839/4170723.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/fejenijovekozu/uc_browser_pc_old_version.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/71163865381.pdfIn PDF document text
    • https://s3.amazonaws.com/lotibabakuj/manualidades_para_hacer_calabazas_halloween.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be0b4600-65a7-43b2-832a-a76b05bc238f/leruzamibiwoligojonusu.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/what_is_effective_communication_in_easy_words.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcc675da-3ee6-407f-b5c3-a5f7ea06694d/dewalt_3400_psi_power_washer_hose.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/nonofaripitivika.pdfIn PDF document text
    • https://s3.amazonaws.com/firudegix/87602585261.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/que_es_el_principio_del_placer_segun_sigmund_freud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed0947d4-93e4-45b5-b469-994f5097cfd7/41010665257.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e54fd64-e3f6-4a45-8969-0c0a07d1bd35/what_should_the_tire_pressure_be_on_a_2015_jeep_grand_cherokee.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26969d6e-e9a5-4172-80f9-d1538d655949/rikam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abfda321-c587-4ab4-820a-4c63fc403843/formato_de_solicitud_de_empleo_para_llenar_e_imprimir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebfdcfe2-f8bd-4487-ae70-d743332f1726/the_imitation_game_movie_download_in_hindi.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_off0000e789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE789 6008 bytes
SHA-256: 4f655e2438c749eb70be62f9846fc436eeefa3aab79a46b925ddd6f3e304285a
font_01_sfnt_off0000fbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE4 11720 bytes
SHA-256: 0493e6560d2ca868c7a81428a388c73e85d9ee4cb283a3effdb1a769e012b9f7

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