Malicious PDF — malware analysis report

Static analysis result for SHA-256 40549afbe83aeba5…

MALICIOUS

PDF

75.3 KB Created: 2021-03-06 05:44:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 82bb61bb52dade1274afae417861e9bf SHA-1: bef47f6b6e53a4ffee6ccb047df27fcd0909c807 SHA-256: 40549afbe83aeba5d262e95cee2e37c42bf700303409da82edf8f19fbd3b5fe8
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. The embedded URL and the document body, which appears to be a garbled search result for a cooking query, suggest a phishing lure. The PDF structure and the presence of external URIs indicate an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://golowaki.ru/award?keyword=what+temperature+does+a+little+chief+smoker+cook+at PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4446030/normal_5fffb092e3d81.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404310/normal_5fe2f224bb2a9.pdfIn PDF document text
    • http://eurosett.net/10948181863g4p8t.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411696/normal_60035509d7c37.pdfIn PDF document text
    • http://ketotreno.buzz/61479586437rgdqt.pdfIn PDF document text
    • http://jumpfs.space/abigail_adams_last_act_of_defiance_answersgfdk7.pdfIn PDF document text
    • http://techanomic.com/prebles_artforms_11th_edition_chapter_1rdhsr.pdfIn PDF document text
    • http://dotavulilego.mypressonline.com/the_warren_buffett_way_review.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/xazarujokemus/taking_sides_clashing_views_in_abnormal_psychology.pdfIn PDF document text
    • https://52c77544-2eb8-427c-ad0e-a8a7e2ea9366.filesusr.com/ugd/93288f_62b6138626d34769a089f2ebfbab4faa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a63f2085-d0ca-436b-aaaf-be3abcacd187/north_east_of_eden_cast.pdfIn PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_69685ba96c014cd79bd20734e703c8d5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/438a800c-8721-4aee-a32f-bf550c5cb49c/life_in_the_woods_walden_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcab9bd0-89d8-4484-b6f3-fca647ee1854/jozukemone.pdfIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/23355023048.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/017b3e69-a86c-4c7e-9a05-d30d424cccdf/naming_ionic_compounds_worksheet_one_answers_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d8a48fe-50c3-43d6-8ae2-040e2bf71137/dunkin_donuts_large_caramel_iced_latte_calories.pdfIn PDF document text
    • http://tiwatimab.atwebpages.com/how_do_whales_help_fight_climate_change.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/auto_collision_repair_and_refinishing_textbook_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/dha_multan_challan_form.pdfIn PDF document text
    • https://s3.amazonaws.com/wizakokowe/navy_seal_fitness_test.pdfIn PDF document text
    • http://saluwagasa.onlinewebshop.net/consolation_of_philosophy_book_1_summary.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_off0000eb10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB10 5472 bytes
SHA-256: 3b5299f02cf6abc088b84c1a53417d85de3687ea783bc5aa9ab8532edfb2b56c
font_01_sfnt_off0000fd8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8B 9896 bytes
SHA-256: 7e6d1875f0f7a41510003f5c05614436749a6163048377cfb034f689724e3299

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