Malicious PDF — malware analysis report

Static analysis result for SHA-256 551b9d865294b0be…

MALICIOUS

PDF

78.4 KB Created: 2021-05-04 01:35:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 76a43e3f09aeb842797c0eef74788228 SHA-1: 2fee28a9d55a1d51b207c0efc5e364f6bbb79dac SHA-256: 551b9d865294b0be1192da94430c76fad3165ca2f596b9ea6e90972ad7683728
126 Risk Score

Malware Insights

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

The PDF contains numerous links to disposable domains, indicating a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to potentially harmful content.

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://maypoin.ru/strik?utm_term=what+are+the+advantages+of+teaching+aids+in+education PDF link annotation
    • https://torovuzexas.weebly.com/uploads/1/3/2/7/132710592/963572.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489713/normal_5fefbe757c6e4.pdfIn PDF document text
    • http://deine-gabe.com/69405053674szjq8.pdfIn PDF document text
    • http://raifaisentapp.online/zewerogefikopisuvilazev8h1z1.pdfIn PDF document text
    • https://dotuxebi.weebly.com/uploads/1/3/1/4/131454754/kobemuzef_worijavorawodes_dutenal_mawul.pdfIn PDF document text
    • http://j3vnci4.xyz/auto_parts_apprenticeship0xghi.pdfIn PDF document text
    • http://all-casino.xyz/just_drift_away4vjz0.pdfIn PDF document text
    • https://kupelaranix.weebly.com/uploads/1/3/4/7/134729830/89f5c286.pdfIn PDF document text
    • https://vemifibu.weebly.com/uploads/1/3/4/3/134354414/04b03368e8deb63.pdfIn PDF document text
    • http://itsamorem.com/how_to_calm_down_someone_with_anxiety_attackpmit3.pdfIn PDF document text
    • http://cardioactiveufficiale.site/bimubepaxi1j1ng.pdfIn PDF document text
    • https://jurutidi.weebly.com/uploads/1/3/5/3/135397820/9140025.pdfIn PDF document text
    • https://zimosamizafokox.weebly.com/uploads/1/3/6/0/136091721/3e81abab88d52.pdfIn PDF document text
    • https://pasorizafam.weebly.com/uploads/1/3/4/0/134096756/aea4e65c2ecfb6.pdfIn PDF document text
    • http://jobs-ingenieur.best/jbl_eon_615_bluetooth_not_workinguax4v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423171/normal_6067cf58dd053.pdfIn PDF document text
    • http://wildber.store/calendario_escolar_2019-20_sep_pueblam0byd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8228169c-0d77-4211-90ec-6cfd415867c1/is_a_declaration_of_trust_valid_after_marriage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb673f7c-706f-4f0d-b366-42d6de05fb0a/where_can_i_buy_fitbit_versa_replacement_bands.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5b70bed-5ee3-4552-ad4f-18f91a087922/free_sat_math_2_practice_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c371c4bb-1ccc-45c8-afdb-a34a60439d36/68762767971.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc7505da-b642-4713-821d-d1a7a2c92a30/how_light_pilot_on_gas_fireplace.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_off0000f46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46D 5324 bytes
SHA-256: a00d2362ee83d53fed14af2e8218bb028fd8872e4b9386ddff1cd0efeee12c09
font_01_sfnt_off00010699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10699 10752 bytes
SHA-256: 95fd247bc4dd7108bd2fc80b73f94ee6a50607287964640b10f73e4a37a348ae

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