Malicious PDF — malware analysis report

Static analysis result for SHA-256 abb81cb5b94a899f…

MALICIOUS

PDF

163.8 KB Created: 2021-01-17 23:05:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: cb86fc467c2ad273201d791c919172dc SHA-1: 0912397b07083c8b9d69c2539d8618373c9c3ee8 SHA-256: abb81cb5b94a899fba2db2f774fce8e5e1171290e7164b103c320e65abfd1066
186 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a credential phishing lure, specifically impersonating Netflix. It directs users to a malicious redirector hosted on weebly.com, which likely serves a second-stage payload. The presence of numerous external URIs and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://murasujudadalox.weebly.com/uploads/1/3/5/3/135338307/dikoto-resenezufalo.pdf.
  • 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://traffset.ru/123?utm_term=bryce+walker+13+reasons+why+season+1 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417998/normal_5fad92c92d204.pdfIn PDF document text
    • https://site-1177591.mozfiles.com/files/1177591/hole__io_update_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/pegipoveridi/hhnSHLg/vanisifigifukotovube.pdfIn PDF document text
    • https://murasujudadalox.weebly.com/uploads/1/3/5/3/135338307/dikoto-resenezufalo.pdfIn PDF document text
    • https://site-1175525.mozfiles.com/files/1175525/melville_island_fishing_report.pdfIn PDF document text
    • https://relugudikovok.weebly.com/uploads/1/3/4/2/134265752/8896748.pdfIn PDF document text
    • https://site-1168409.mozfiles.com/files/1168409/artillery_3d_printer_sidewinder_x1.pdfIn PDF document text
    • https://site-1191950.mozfiles.com/files/1191950/paypal_account_limited_fake_email.pdfIn PDF document text
    • https://site-1168349.mozfiles.com/files/1168349/nexusevopu.pdfIn PDF document text
    • https://site-1175725.mozfiles.com/files/1175725/racing_war_games_ps4_vs_xbox_one.pdfIn PDF document text
    • https://site-1175354.mozfiles.com/files/1175354/design_and_analysis_of_algorithms_tutorialspoint.pdfIn PDF document text
    • https://sorefumegevori.weebly.com/uploads/1/3/1/8/131871670/funitirarevoxaxuku.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://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_off00023bb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23BB7 5068 bytes
SHA-256: 6ac8bd0b0e40ef861ee3b1560faee12568a63d287229d95eeb33f9226d0aa96d
font_01_sfnt_off00024cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24CF9 11384 bytes
SHA-256: a2f0f9aca42d2220e1c667b9b3573ecd2c9cd77073626cd2ea4273edcf75b4ba
font_02_sfnt_off000273a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x273A4 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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