Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd5b480ff1f9130b…

MALICIOUS

PDF

81.3 KB Created: 2021-04-01 15:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 022453b02328989ea6efd114d8e8fa88 SHA-1: d94675803cf5a4d0452711933b05c627b72733ee SHA-256: bd5b480ff1f9130be7e8ed975c9ef199eb06450e4b730469db257630391f9f4c
126 Risk Score

Malware Insights

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

The PDF document contains an external URI pointing to a suspicious domain, identified as a phishing lure by ClamAV and ML classifiers. The document's content, though heavily obfuscated, appears to be a deceptive lure related to 'electrical engineering' to entice users to click the malicious link. No scripts were extracted, but the presence of external links and the heuristic firings strongly suggest a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://vilenefex.ru/award?keyword=basic+definition+of+electrical+engineering+pdf PDF link annotation
    • https://cdn.sqhk.co/merabuvi/JhfjheQ/mumofok.pdfIn PDF document text
    • https://cdn.sqhk.co/bexefoboxevi/WsVdghF/ikea_lunch_hours_burbank.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454429/normal_60128f26c9ecd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489244/normal_605aae09a7598.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376404/normal_60469670517f7.pdfIn PDF document text
    • https://cdn.sqhk.co/kuregemuwu/5VicDyN/52164288907.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460447/normal_5feedfb2744e6.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
    • https://234d5d8d-19c9-4cab-a884-dd0775662658.filesusr.com/ugd/fb7225_ff2c5ba42ccc4efc895276cabdcc5f61.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/24c28999-7d6b-4db8-9682-f00dc5aded5a/79570243844.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03fedcd2-7269-4f2b-884d-a7b3196f1bf6/dosagaxikipuganigofiduxuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3305b182-7552-4f06-b4fe-e69280bb5cd6/gipixewadawu.pdfIn PDF document text
    • https://b18ac5c8-c825-4c59-a0a1-290c879ce4f6.filesusr.com/ugd/1a0fde_5432ff33e673459d9583d63a542819e3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5aa1425c-833d-4a7c-bca4-3ad69690236f/como_desarrollar_la_inteligencia_emocional_en_los_nios_libro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82ad2b52-6958-4e5b-b577-9221961a8fac/94503081127.pdfIn PDF document text
    • http://rozogev.rf.gd/95838909652.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b94b988d-e30a-4fc6-a338-b158eb8d8ee3/student_led_conferences_reflection_sheet.pdfIn PDF document text
    • http://gulavofi.epizy.com/sazega.pdfIn PDF document text
    • https://d2d87fd5-5f4d-49aa-ab3c-2263ce4b5d22.filesusr.com/ugd/9169d2_60b2a390b9364ebeaabcf5e9a63ae883.pdf?index=trueIn PDF document text
    • http://fifomivosa.rf.gd/xenogenesis_piano_sheet.pdfIn PDF document text
    • http://sobegomogi.rf.gd/3913896791.pdfIn PDF document text
    • https://9a4b5e96-23fe-4021-9525-787506808755.filesusr.com/ugd/b3318b_118b327b1b594314967190f5c7631478.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5de831e8-adfd-4af8-b207-9376374a7f89/how_to_become_a_dietitian_in_the_uk.pdfIn PDF document text
    • http://sozidimimu.rf.gd/how_to_do_an_interview_spread_tarot.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D1 5160 bytes
SHA-256: 3795f11674d4efaebd5e18fff36cb22ce4277fcbbb77fb86ba15d0ae919f00e7
font_01_sfnt_off00010259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10259 11544 bytes
SHA-256: 20b29e261792772961a60e2a8bb204d31d62ae0b496d1c8084acc5b17fa98a79
font_02_sfnt_off000128e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E5 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361