Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a3da5c795aa4485…

MALICIOUS

PDF

70.0 KB Created: 2021-04-01 17:18:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 77929af5fcda81555073662e6cb237a7 SHA-1: 0cc7d36bfa35abc80395efff3468d71f92ae59ca SHA-256: 1a3da5c795aa448528ee45d80ac55e92e77ca25bfdb8d289290c7713155af65f
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malicious redirection scheme. The document body, though heavily obfuscated, contains keywords related to a novel and PDF, aligning with the lure of providing a document, while the embedded URLs are the primary mechanism for delivering the malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/wix?keyword=the+beginning+after+the+end+novel+pdf+espa%25C3%25B1ol PDF link annotation
    • http://kitafoged.medianewsonline.com/62629714343.pdfIn PDF document text
    • http://derilezin.sportsontheweb.net/original_bhagavad_gita_in_english.pdfIn PDF document text
    • https://sulumakopata.weebly.com/uploads/1/3/0/7/130775191/wajesusulave.pdfIn PDF document text
    • http://devgm.design/66070948824tpoib.pdfIn PDF document text
    • http://wijetaz.mypressonline.com/resumen_del_libro_platero_y_yo_para_nios.pdfIn PDF document text
    • http://skout.tech/how_to_get_instantaneous_velocity_from_a_graphs08zs.pdfIn PDF document text
    • http://instapriz.site/mba_in_operations_management_salary_in_indiaoqen2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454813/normal_602d606eeb4af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374847/normal_5feb7c4cbfabb.pdfIn PDF document text
    • http://tiktokhd.design/depaxawevorofulvx98h.pdfIn PDF document text
    • http://barashik.space/break_time_vape_couponr7rk0.pdfIn PDF document text
    • http://gogogoinst.xyz/emerson_gxt3-2000rt120_manualc49sv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427780/normal_5fff039d38b0a.pdfIn PDF document text
    • https://wosabawa.weebly.com/uploads/1/3/5/3/135390578/8748346.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420915/normal_5fee657545f36.pdfIn PDF document text
    • http://meetchat.space/zosuvogi2tjqw.pdfIn PDF document text
    • http://italylife.pro/keyboard_typing_speed_test_freebk1an.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470962/normal_605f70e2638db.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zitasixan.atwebpages.com/what_is_written_law_in_malaysia.pdfIn PDF document text
    • http://tiluxusimutine.atwebpages.com/bondy_and_murty_graph_theory_solutions.pdfIn PDF document text
    • http://mulapoxe.onlinewebshop.net/79694250809.pdfIn PDF document text
    • http://xufolat.atwebpages.com/explain_the_generally_accepted_accounting_principles_with_examples.pdfIn PDF document text
    • http://wopojofa.atwebpages.com/dikori.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_off0000cff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF2 5664 bytes
SHA-256: 2b9393fc7e78619bb06f86f9af27fb28a5e4d0ee678422077e2c5fd9edbf2629
font_01_sfnt_off0000e2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F2 11740 bytes
SHA-256: ccb92a8ba8f00aafafcb83f0bd8f5e38801a7e5796aa168deadf2507e77c8a32

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