Malicious PDF — malware analysis report

Static analysis result for SHA-256 683ff2eb17ece3fb…

MALICIOUS

PDF

66.9 KB Created: 2021-05-02 13:34:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 5873970177701705a8d00f2be6c15d9d SHA-1: 5c90b0a757cb1cbba5f6d129e15db402ab7f8430 SHA-256: 683ff2eb17ece3fbd99c6baf803172345385bab8c33d945e2ab6c98e673bf610
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 pointing to disposable domains, suggesting a link farm or redirection infrastructure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on potentially untrusted hosting, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=metaphor+worksheets+for+grade+4 PDF link annotation
    • http://onlyforyou.space/data_warehouse_lifecycle_toolkit_freef3uzc.pdfIn PDF document text
    • http://you-bestshop.xyz/weight_lifting_classes_for_beginners_near_mefaba6.pdfIn PDF document text
    • http://missunik.space/directv_4k_genie_mini_clientr6y6w.pdfIn PDF document text
    • http://shopsmmv.site/power_pressure_cooker_xl_sweet_potatoespaxcd.pdfIn PDF document text
    • https://cdn.sqhk.co/purilusevike/f7hapOM/glitter_name_live_wallpaper_glitzy.pdfIn PDF document text
    • http://4338bacchus.com/crc_card_templatehanji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456376/normal_5fe604a30a684.pdfIn PDF document text
    • http://mantenancie.com/44136808305d4yo1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476142/normal_5fed650497dca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377925/normal_606a75be81d9a.pdfIn PDF document text
    • http://maewallace.com/picsart_apps_apkpurexy7kd.pdfIn PDF document text
    • https://cdn.sqhk.co/fizuborugas/cW2Dgdk/z_nation_murphy_wikipedia.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3e3188f7-d9e9-48da-9af6-4e6760718ee0.filesusr.com/ugd/4f7562_80913fb52542426ea57e748d5d870f7e.pdf?index=trueIn PDF document text
    • https://55d63786-14d6-44de-84d0-33f1fb383c44.filesusr.com/ugd/45fd81_dc2bd3dd3a54450594799d4b67d848dc.pdf?index=trueIn PDF document text
    • https://7f06b679-e14d-4525-8955-d56a7cf6f710.filesusr.com/ugd/79e5df_e0f921ed6e634bf09b686a0e7697ec07.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb599c96-f023-4bdf-ba7c-f844eee974ce/64703447264.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab302cb4-158f-43c2-aa05-dac03069f668/sigelei_mini_30w.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2f48845-2cdd-4a1c-87bd-ea2b14ddcf7f/que_es_oligopolio_y_ejemplos.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_off0000c85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85B 5520 bytes
SHA-256: 2c1d157c13c20f5c22738366c226944cfbd1244817e7f87b4e2f6f91e40dec66
font_01_sfnt_off0000db3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3E 10660 bytes
SHA-256: e898a508233ba63d16ca3d16d47c2b4e83440c11006c7bdcc401fcfbdee44fc2

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