Malicious PDF — malware analysis report

Static analysis result for SHA-256 998fe2ba38c84038…

MALICIOUS

PDF

82.9 KB Created: 2021-04-03 14:23:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 302af450d22ee2ab950796851c79a6c0 SHA-1: ea509000bdd6594422ed96ccdb68ffffad180f19 SHA-256: 998fe2ba38c8403866cb974f6e8be651b8e7ea7f889be147a891bed92471146f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://soxebez.ru/strik?utm_term=new+cpt+codes+for+2020+pain+management PDF link annotation
    • http://gowanenutik.mypressonline.com/nervous_system_quiz_anatomy_and_physiology.pdfIn PDF document text
    • http://gonifarej.mywebcommunity.org/analysis_of_algorithms_book_free_download.pdfIn PDF document text
    • http://kofupum.mygamesonline.org/65593276319.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494451/normal_5fcc46bc27496.pdfIn PDF document text
    • http://meetsol.xyz/23336175319rlg8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375070/normal_602d8744567e4.pdfIn PDF document text
    • https://cdn.sqhk.co/zidulibu/e3enFhE/vosirorodu.pdfIn PDF document text
    • https://cdn.sqhk.co/nujidegowupi/xhcjbDs/82330768525.pdfIn PDF document text
    • http://tryraisins.pro/jedakovawivixusoxokagdgjv.pdfIn PDF document text
    • https://cdn.sqhk.co/wakivugex/ghCshct/alita_battle_angel_anime_movie_download.pdfIn PDF document text
    • http://mylic.ru/scag_patriot_error_codespcith.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496402/normal_604029e616a51.pdfIn PDF document text
    • http://tapasin.sportsontheweb.net/ischemic_dilated_cardiomyopathy.pdfIn PDF document text
    • http://reduslimitaly-ufficiale.site/como_leer_tablaturas_de_guitarra7juce.pdfIn PDF document text
    • https://cdn.sqhk.co/guviterolovu/hdohhgh/cystic_fibrosis_treatment_guidelines.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CDWhbqq/bamogapewinifusofenarilog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376610/normal_602ea89cd21ce.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://b0cee159-9ce3-47d2-9452-de9e383f1b6b.filesusr.com/ugd/fac5c7_9e826670fb08401eb14828273d7d5e13.pdf?index=trueIn PDF document text
    • https://e9593579-f51f-4dc6-af55-2543ab512b45.filesusr.com/ugd/37952c_5423d137a81b4e02998e2bd710ec8199.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3696bc6-dcc1-44c4-907c-ab51d1c38626/glenfield_model_60_parts_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8d34a89-a511-4f5b-a792-a15d79d4053f/varidokoxipudipozez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74656264-8be7-4c2b-a9cd-1b673c829906/26797645446.pdfIn PDF document text
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_5de5ec4c577644b2a7c89c4c75145f80.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c82c255a-b338-4cc4-9e74-da7fbe8033d6/belimebisoxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4e3b556-bf8d-4944-bc2e-f4819f5cc5e6/wahl_lithium_ion_2.0_trimmer_charger.pdfIn PDF document text
    • https://74269c25-1731-4359-90d4-804f54ef9c1c.filesusr.com/ugd/b5973a_6fa23db09ec549c29a7bf3efd9ba8207.pdf?index=trueIn 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_off0000f635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF635 5568 bytes
SHA-256: ba1f7f77a65e65e762f83199c2fbe7710568d489c8900ae43c3679dfd6741732
font_01_sfnt_off0001091b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091B 10760 bytes
SHA-256: 45ed27cb91a51f711e51f4973582b4a28a1327252e7dd8dc71ecbc381ea913b6
font_02_sfnt_off00012e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E06 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71