Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee56b50c4d3a808e…

MALICIOUS

PDF

82.6 KB Created: 2021-03-10 07:02:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3cb5ec6f91c08e82dbd30f2be8b7165f SHA-1: 29d8926b7565a677b250d131cec36eee37b33ea6 SHA-256: ee56b50c4d3a808e4de12ba44ee5607ce06ea9f7416f1db72ec82e2dca883f58
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting sites and are likely part of a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic strongly suggest a phishing or redirection attack.

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://jacksth.ru/award?keyword=alkaline+acid+food+list+pdf PDF link annotation
    • http://reduslimitaly-ufficiale.site/how_to_make_watercolor_paper_procreatexgsrp.pdfIn PDF document text
    • http://adyga.site/55843467964a9vyt.pdfIn PDF document text
    • http://reduslim-italiaufficiale.site/78987595394g1d6k.pdfIn PDF document text
    • https://cdn.sqhk.co/bomunerafoju/ZrVpL3c/kick_the_buddy_free_app_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/dafisuwikib/haJifia/95429693318.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugavu/Q7iaSrq/pomalojelanatoperajepada.pdfIn PDF document text
    • http://samoe-samaya.ru/nimonibine98n.pdfIn PDF document text
    • http://playmarket-online.com/the_dream_dictionary_from_a_to_z_the75pwe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://2e6726a7-2e78-456a-9fa1-8bc85c3b20a6.filesusr.com/ugd/76e31d_36a9edc4f0a143a3ab630f32cb06b101.pdf?index=trueIn PDF document text
    • https://a80c0318-1640-4d50-a016-df037fc402b9.filesusr.com/ugd/895bef_53da45e1a239409896b30495e1822a10.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/60ed8088-c8ab-4e7d-9d57-f3f25f3940f1/xeleg.pdfIn PDF document text
    • http://suxuwumona.epizy.com/causative_exercises_rewrite.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a49d1b61-0744-4147-ac5c-85e758daa371/naretelujiwaxig.pdfIn PDF document text
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_278097bd740c4631adcffb8a0e8141d9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/05467401-df35-45c7-8c78-8a275d6286f0/88377190964.pdfIn PDF document text
    • http://rejoxudirux.epizy.com/lomukozanik.pdfIn PDF document text
    • http://nikubudujeguli.epizy.com/how_to_write_a_short_story_in_english.pdfIn PDF document text
    • http://zogesosiguzep.rf.gd/mogikugiko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74cfc704-4245-4758-b15a-09b612521168/que_significa_fecha_de_corte_en_tarjeta_de_credito.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bfe2f74-3cd3-4b05-9a49-9d3024ac7883/latest_celebrity_news_uk_gif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0a003ec-6471-45a3-a5c0-50470e2c9e61/5209545981.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABB 4896 bytes
SHA-256: 5f14357411c88c64f88b25176f053fb7cf28325c484228fbe43a45b002de1a94
font_01_sfnt_off00010b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B69 10324 bytes
SHA-256: a2b3fe6e3d7f5d4fbf0922de42d0134d7869cb17526dd932bf8eeb94e6b1ab25
font_02_sfnt_off00012eb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB8 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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