Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b27c23863438f61…

MALICIOUS

PDF

142.4 KB Created: 2021-03-20 23:37:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 866a085ee49b865c8071cc97036e4aac SHA-1: 1c49cd96fd80026d483bda123ae4983edf2301dc SHA-256: 8b27c23863438f6165968cf7771521640a991e04a55cefb742730e5a9a096772
126 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains multiple embedded URLs, with a notable heuristic indicating it's part of a link farm on disposable hosting. The PDF's structure and embedded URIs suggest an attempt to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://druttle.ru/award?keyword=fisiopatologia+de+cirrosis+hepatica+alcoholica+pdf PDF link annotation
    • http://fevofawemuwa.medianewsonline.com/74555048243.pdfIn PDF document text
    • https://cdn.sqhk.co/gixenako/hdHKahh/takapijiwuwiboxoburo.pdfIn PDF document text
    • https://cdn.sqhk.co/govazofaj/QjhyPdw/awd_cars_for_sale_near_me_under_10000.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/q9mgcVH/lavimarosixuwederatesuj.pdfIn PDF document text
    • https://cdn.sqhk.co/sidamebo/ewhgYjf/download_game_idle_light_city_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/xesozugis/6kGLhEU/14591342254.pdfIn PDF document text
    • https://cdn.sqhk.co/vopuvafamiw/qijjfHs/79376940467.pdfIn PDF document text
    • https://cdn.sqhk.co/jobubexivex/aoUY9Vy/13073096719.pdfIn PDF document text
    • https://cdn.sqhk.co/mimofeto/hcA3jeu/ladisizobovap.pdfIn PDF document text
    • https://cdn.sqhk.co/rowunozimop/l3lHNhd/simple_business_plan_sample_for_students.pdfIn PDF document text
    • https://cdn.sqhk.co/xojelumegasi/XgdZKic/horizon_fitness_treadmill_older_models.pdfIn PDF document text
    • https://cdn.sqhk.co/fedugaxoloz/igsZnii/56757620020.pdfIn PDF document text
    • https://cdn.sqhk.co/mokopizel/hbhfi7B/real_cricket_20_download_for_pc_without_bluestacks.pdfIn PDF document text
    • http://pawomodom.medianewsonline.com/contextual_behavioral_science.pdfIn PDF document text
    • https://cdn.sqhk.co/xugiwatokax/NzhdjfZ/aplikasi_brainly_apk_pure.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fowimifefezujo.myartsonline.com/fevozosuda.pdfIn PDF document text
    • http://fataragoreb.myartsonline.com/tipidimatejin.pdfIn PDF document text
    • http://namakanexir.atwebpages.com/athens_greece_bus_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3671c5bb-5634-4ec7-8f18-84113d8481dd/elbert_hubbard_quotes.pdfIn PDF document text
    • http://fazafowunop.epizy.com/kerrville_tx_accident_report.pdfIn PDF document text
    • http://kuzebelinebofe.epizy.com/72525000759.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75f4253d-fe5f-47aa-8a47-31bc4e887eb7/tuxibisubeba.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D881 5372 bytes
SHA-256: a99e8c1db4ad0a58427015dfc3b37151f4adb695fcc4154d6be38be4aea9b9f5
font_01_sfnt_off0001eac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EAC6 12492 bytes
SHA-256: a62ed2982a5c8d43890fac768b3898968fc429a7e34b99eacdb90384c2fa50d2
font_02_sfnt_off00021428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21428 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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