Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5b2970bf1232a58…

MALICIOUS

PDF

155.4 KB Created: 2021-01-26 18:10:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 53ec1b29aefb326ebbe8dd6ae257fdec SHA-1: 21abee55fcb20834039e1f9e03d5ff2d90b2b1bc SHA-256: b5b2970bf1232a580424ec1e7c8b080c4d9c661e49270de5734b4c965c7d4d1c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting services, indicating a link farm designed to distribute traffic. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a malicious tactic. While no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/aws?utm_term=landing+page+templates+free+bootstrap PDF link annotation
    • https://lifitexuga.weebly.com/uploads/1/3/4/3/134356919/tizudomod-kinugal-bupabetujijelo-bogopodu.pdfIn PDF document text
    • https://saxeguwub.weebly.com/uploads/1/3/1/4/131406831/2b0e7fae87.pdfIn PDF document text
    • https://cdn.sqhk.co/sigidezok/BW9gjhg/pocket_league_story_2_best_skills.pdfIn PDF document text
    • https://monijakuxit.weebly.com/uploads/1/3/4/3/134362478/2374378.pdfIn PDF document text
    • https://cdn.sqhk.co/letonolomo/jaZjiap/ti_nspire_calculator_online_free_use.pdfIn PDF document text
    • https://cdn.sqhk.co/lutaxudepoje/nhhaIgh/medbridge_education_reviews.pdfIn PDF document text
    • https://xiruzavaxukegaf.weebly.com/uploads/1/3/5/3/135324830/19a6cd7f08cf.pdfIn PDF document text
    • https://xotozefubineru.weebly.com/uploads/1/3/4/5/134576546/terepuk-pakusarugi-wubiditeza.pdfIn PDF document text
    • https://cdn.sqhk.co/repudodo/FphbLhf/kodera_wire_stripping_machine.pdfIn PDF document text
    • https://nexawukuvinu.weebly.com/uploads/1/3/4/5/134578226/4043250.pdfIn PDF document text
    • https://ginuwawabesinu.weebly.com/uploads/1/3/1/1/131164414/3017741.pdfIn PDF document text
    • https://namikefazexu.weebly.com/uploads/1/3/1/6/131606603/somizurezumizaxipo.pdfIn PDF document text
    • https://cdn.sqhk.co/fedovipawe/cEjghjW/30880360324.pdfIn PDF document text
    • https://xesisawizes.weebly.com/uploads/1/3/1/6/131606125/7765186.pdfIn PDF document text
    • https://nurafotupitu.weebly.com/uploads/1/3/4/4/134495453/d66a2386858.pdfIn PDF document text
    • https://cdn.sqhk.co/xugosovemi/igfwQY9/oscar_de_la_renta_sunglasses_fabfitfun.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://s3.amazonaws.com/dewutexorob/wixuvikipopatadosekipenu.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/pigosawolivemijikefinasa.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/attraction_movie_2017_english_subtitle.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_off00021a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21A9A 5232 bytes
SHA-256: fd5a4aa908f9c4d67ff8d3bd4352e640cdc466c5603ba578038817304f7ccdbb
font_01_sfnt_off00022c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22C43 10916 bytes
SHA-256: a4ca1c73a27d0b3a199aec248bf6802be7e9a2067aed674a36ad76149eba5fa8
font_02_sfnt_off0002515d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2515D 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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