Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb760bac6de89c4f…

MALICIOUS

PDF

78.9 KB Created: 2021-03-12 11:21:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 830f46eab02e3125d366831582dbc13b SHA-1: 107ca6198e67806537403ecdea7ef8eae0bdd638 SHA-256: eb760bac6de89c4fd31b2e07aea832da63f27fadd5b2b0bfed601e100b86c4b2
244 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to disposable hosting and redirector infrastructure. The heuristic 'PDF_SEO_LINK_FARM' indicates a link farm, and 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms redirection to malicious sites. ClamAV also detected this as 'Pdf.Phishing.Trojan'. The document body is heavily obfuscated, but the presence of URLs and the heuristic firings strongly suggest a phishing or malicious redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://dafemum.ru/wix?keyword=edit+apk+source+code In PDF document text
    • https://mejojesakawevud.weebly.com/uploads/1/3/1/4/131438193/ragosupofuserul.pdfIn PDF document text
    • https://lizelizana.weebly.com/uploads/1/3/1/4/131409616/zeludokikutizi_gisabe.pdfIn PDF document text
    • https://cdn.sqhk.co/denugesugumu/bjhhcii/vukisewuvu.pdfIn PDF document text
    • https://vagewojevibo.weebly.com/uploads/1/3/4/8/134873572/db84c3.pdfIn PDF document text
    • http://maslovauto.ru/retro_bowl_tips_runningygv04.pdfIn PDF document text
    • https://lelameju.weebly.com/uploads/1/3/4/0/134040913/taworuzatetu.pdfIn PDF document text
    • http://palitra-cveta.ru/92565361144uteoe.pdfIn PDF document text
    • http://liketime.online/ar_15_operation_gifpoxz3.pdfIn PDF document text
    • http://patajafurep.mywebcommunity.org/how_to_find_acceleration_due_to_gravity_at_different_altitudes.pdfIn PDF document text
    • http://raicen.com/zosujajofokasagul9xmt.pdfIn PDF document text
    • https://cdn.sqhk.co/jurufovowufu/gwvJFZU/raid_hq_hack_apk.pdfIn PDF document text
    • https://tudexabi.weebly.com/uploads/1/3/4/7/134770635/69a5777f.pdfIn PDF document text
    • http://nakodinita.scienceontheweb.net/manalirovegevuforeziv.pdfIn PDF document text
    • http://worozoxiw.sportsontheweb.net/80076051669.pdfIn PDF document text
    • http://copyright-infringement.business/fruit_and_vegetable_planting_guidefevay.pdfIn PDF document text
    • https://cdn.sqhk.co/jobubexivex/kXiaZKr/narajejenos.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
    • http://niwimugosaz.onlinewebshop.net/90786131582.pdfIn PDF document text
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_c6f09eee2e694d11a71f733be247c10d.pdf?index=trueIn PDF document text
    • https://bad3f395-1638-4667-b349-d6f934eeab49.filesusr.com/ugd/ed2d23_c73978d45cca4e92bb76a07be6609c7c.pdf?index=trueIn PDF document text
    • https://b615eccc-4413-4b1d-8109-ede925130a83.filesusr.com/ugd/0994f9_9c5d60035c474b5698585328d95800c8.pdf?index=trueIn PDF document text
    • https://8dcf3d85-40eb-4350-b789-ae6ac2c46e24.filesusr.com/ugd/21d17a_62b5a42685bc45afa7b61cbd3e1cb3a1.pdf?index=trueIn PDF document text
    • https://76f5a3e5-08d8-4581-9975-6c1b933a1845.filesusr.com/ugd/dbbd16_6db4fb4aba3e4be089e951312bbfd6fa.pdf?index=trueIn PDF document text
    • https://db7841a4-af10-4990-a2be-f084cd4acbf6.filesusr.com/ugd/e3c460_df1ec565ee074bc2859061415f19de5b.pdf?index=trueIn PDF document text
    • https://e0eedba4-cf99-4c42-97f5-d3f9ae5832dd.filesusr.com/ugd/e36ea7_a6bdaebd020a47b399b7dc17069ce9ee.pdf?index=trueIn PDF document text
    • https://6cf80756-66c2-4d2e-b15d-ff1677cb7115.filesusr.com/ugd/2257e8_1c4b70c7ad9f42c8a02676759cd47e42.pdf?index=trueIn 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_off0000e467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE467 4832 bytes
SHA-256: f99c16afc28c65654221e35d34f8a87da606faa49bfb2fda0460888a15ee8dd2
font_01_sfnt_off0000f4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4ED 13372 bytes
SHA-256: 5800450bb5c844f8e6e081e847c450e1115b63e60992c662f3b36e2fb67cfb49
font_02_sfnt_off00011fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFF 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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