Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ec3a99fd3829b0…

MALICIOUS

PDF

67.7 KB Created: 2021-04-04 05:13:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: b41b7038fe03c816cca4626449b44a25 SHA-1: b5cdcbcf8e13afbef0e8dd541421e1323e405f2b SHA-256: b8ec3a99fd3829b0ebab010b46cb6c2c976972b8153838606bc82ad7f7e4b106
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs, many hosted on disposable domains, suggests a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/123?utm_term=365+panchatantra+stories+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4410986/normal_5fee9d3f90963.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380857/normal_5fd5f95218c6d.pdfIn PDF document text
    • https://cdn.sqhk.co/vugasoveg/I3Qjisj/escape_from_alcatraz_full_movie_online_watch.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484997/normal_60181ff38ca22.pdfIn PDF document text
    • https://cdn.sqhk.co/nevupediwix/dihDigi/gusedesifanugorax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424689/normal_606913f648a3a.pdfIn PDF document text
    • http://vobafoselalulor.mypressonline.com/model_3_owners_manual.pdfIn PDF document text
    • http://wujasonuvilo.mywebcommunity.org/94670247698.pdfIn PDF document text
    • https://cdn.sqhk.co/zovitamojim/cZ5OXif/sea_land_air_burger.pdfIn PDF document text
    • https://cdn.sqhk.co/bipokagiti/eiczHp4/jafepunen.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390661/normal_5fe5d803d36de.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/laginekux/contemplate_definition_synonyms_and_antonyms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1407c567-c4f5-4773-9dad-d58674cfb472/how_to_reset_kitchenaid_ice_maker.pdfIn PDF document text
    • https://c948e902-2437-43f3-9f1e-7aaad30688a7.filesusr.com/ugd/464a75_c12b9b947a1542ef94bedb22ef2d3831.pdf?index=trueIn PDF document text
    • https://73856814-13bb-4d44-aeaf-752cce6ba6bd.filesusr.com/ugd/a0d21a_94e07a3574574b578ecd33f50e1c14b8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rimepusox/tinoxafejipewuwugivexij.pdfIn PDF document text
    • https://1ebfeea1-7d02-43b8-8f0a-002c87bc7f75.filesusr.com/ugd/50dcf6_36797d3dc1db473780ef5f05beeb14d6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/janodojivi/28657403793.pdfIn PDF document text
    • https://11484d69-1612-41b9-9199-165df1f08223.filesusr.com/ugd/e2f197_7a00f05a0e5b4f089c308a7cbc2836a0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8593bf5d-38ca-430e-99bd-a7a74b76c955/jarodovejaxetakebiwaxirix.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/capacitive_level_sensor_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/panepusesixepine.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_off0000cbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC7 5560 bytes
SHA-256: c1a4c3e84072ec3eb1e2f0eba4ea278e3e81771b96013b538aee85f384e34621
font_01_sfnt_off0000dea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA2 10608 bytes
SHA-256: c71f07bf8bcbf08d07e18b745d2e99546ecad2570295abb66bea2fdd9f522bb6

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