Malicious PDF — malware analysis report

Static analysis result for SHA-256 61ab509ec11c9023…

MALICIOUS

PDF

78.0 KB Created: 2021-03-20 05:41:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: e3abce2df71c260701f20be722bb8774 SHA-1: 8e9530176dbbf88aeabac775efe4a30bd9a11d09 SHA-256: 61ab509ec11c9023514c20123a371e267e646b9a814bd0f75536bf2ab8991e25
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains heuristics indicating it is part of an advance-fee scam, specifically using a lottery claim form lure. It embeds multiple external links, with one prominent URL leading to a redirector that likely serves malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the exploitation of a PDF vulnerability to execute a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://resalured.ru/123?utm_term=national+lottery+scratchcards+claim+form PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382621/normal_603aca0ad55d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370561/normal_604ff0947d242.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472760/normal_603e68b76a1a7.pdfIn PDF document text
    • https://nufirejibojo.weebly.com/uploads/1/3/4/6/134645492/051ce3b80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370071/normal_6047794b59b2c.pdfIn PDF document text
    • https://sibibogug.weebly.com/uploads/1/3/5/9/135990875/5199850.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464871/normal_604b42cc0c00b.pdfIn PDF document text
    • https://cdn.sqhk.co/toxinize/gfC4giJ/thor_lord_of_storms_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/rifibimilo/3FAidij/kapamimonilajezajolaki.pdfIn PDF document text
    • https://zikowajemaje.weebly.com/uploads/1/3/1/6/131607239/641497.pdfIn PDF document text
    • https://cdn.sqhk.co/nomelafu/figmGge/zegewoxaw.pdfIn PDF document text
    • https://jiviwakabukowe.weebly.com/uploads/1/3/4/0/134096071/giropezuwujoju_rovotijenibupep.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/wovisak/xokedemupunoxasesurodali.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/fopevipezure.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/somutofevuxil.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/regulatory_reporting_information_system.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/sojolesunu.pdfIn PDF document text
    • https://s3.amazonaws.com/rejiner/present_continuous_tense_worksheet_grade_7.pdfIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/business_process_flow_template.pdfIn PDF document text
    • https://s3.amazonaws.com/gagotaniwipure/resutadaze.pdfIn PDF document text
    • https://s3.amazonaws.com/kegovev/how_do_i_reset_a_sentry_safe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c801632e-a917-4886-b96a-a190b05a92a8/is_it_illegal_to_own_a_lockpick_set_in_georgia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3a9c861-87c9-4e50-b8ea-63348b74c1f8/what_demon_is_in_astas_grimoire.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_off0000f11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11E 5332 bytes
SHA-256: 8b10d1bd1bdd6c54a60f80c8e173d407b69ec125ec0bd54aedfe93e7e286edec
font_01_sfnt_off00010326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10326 10844 bytes
SHA-256: 0e7faa993b8aabde8050cdadb7b5d0e7987d6307320fa7990ba286e96afb8487