Malicious PDF — malware analysis report

Static analysis result for SHA-256 902c0d8f2ad19910…

MALICIOUS

PDF

119.2 KB Created: 2021-03-19 14:50:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b187ccfae9d1dd6003c3e25b3dd89ba4 SHA-1: 7445e5262fb9f913df93c1b241e62ea9cdedbff1 SHA-256: 902c0d8f2ad19910093124516cbd7288bc20e40dde6b86c0fb230359084459e6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a malicious document designed to redirect users to attacker-controlled sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/123?utm_term=iron+jawed+angels+worksheet+answer+key
    • https://cdn-cms.f-static.net/uploads/4386092/normal_603d2b6730ec6.pdf
    • https://jamaxukupabidi.weebly.com/uploads/1/3/4/6/134675967/5096304.pdf
    • http://velesvoyage.ru/95047021355yhlzo.pdf
    • https://ligizedafovawu.weebly.com/uploads/1/3/2/6/132680967/ab3bc6.pdf
    • http://world-wildshop.com/the_three_billy_goats_gruff_activities_for_early_yearsp42q2.pdf
    • https://static.s123-cdn-static.com/uploads/4467017/normal_5ffb9e8b2b769.pdf
    • http://znatural.space/gikurodapesonorisivobezegqjc6.pdf
    • https://dawemewi.weebly.com/uploads/1/3/4/7/134747996/2300464.pdf
    • https://kikosezuzo.weebly.com/uploads/1/3/1/3/131378972/wajolofubuv.pdf
    • https://rofixuninapo.weebly.com/uploads/1/3/5/3/135313709/sorub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kifutizijebuj/microsoft_sql_server_for_windows_10.pdf
    • https://uploads.strikinglycdn.com/files/f6b431c6-589b-434a-88d8-e5350e72511c/zinuwulomef.pdf
    • https://uploads.strikinglycdn.com/files/cc75fc6b-b921-4e79-8a60-05df4814957d/safodewimezi.pdf
    • https://s3.amazonaws.com/lorifawuvawot/calling_stored_procedure_in_spring_jdbctemplate_example.pdf
    • https://uploads.strikinglycdn.com/files/5f19d8e9-5e76-4922-b762-af009762cf7c/jegewonusakov.pdf
    • https://s3.amazonaws.com/vibuvomomuv/what_temp_is_ideal_on_brinkmann_smoker.pdf
    • https://uploads.strikinglycdn.com/files/43b458d8-5cf7-43ae-a6d7-63b86e9e2ab6/77611457812.pdf
    • https://s3.amazonaws.com/fonibinaraj/everyday_hsm_sheet_music.pdf
    • https://uploads.strikinglycdn.com/files/06d47d03-666c-4ccd-9070-7d9ba5f89f5c/mapa_comunitario_de_riesgos_ppt.pdf
    • https://s3.amazonaws.com/befafuni/vazinikafobibimujube.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001949d.bin
dac15edddfc24670ebadd9b5508cec84b29252099a8b96a57db8bbaf562052cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1949D 5356 bytes
font_01_sfnt_off0001a6e6.bin
6b41f5a3f3c9ab79c2c55eee23a90d86636308083f27611796f9af1f9879642f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6E6 11368 bytes

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