Malicious PDF — malware analysis report

Static analysis result for SHA-256 15825d7935b09ea6…

MALICIOUS

PDF

79.8 KB Created: 2021-04-14 09:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 76b8c036b4f1d69ff5aa29e163f13b76 SHA-1: 8ec7fdc9b548742142500e46ba0347edb99bfe31 SHA-256: 15825d7935b09ea6ded90ac69738f8462f23b3745b5c07d4d348082e81ed6aa0
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with a primary suspicious URL being 'https://gimoguvi.ru/strik?utm_term=vizio+e550i-b2+no+picture+no+sound'. The document body, though heavily obfuscated, suggests a lure related to technical issues, potentially to trick users into visiting the malicious site. The presence of multiple disposable hosting links further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://gimoguvi.ru/strik?utm_term=vizio+e550i-b2+no+picture+no+sound PDF link annotation
    • http://indital.fun/jesus_storybook_bible_curriculum_preschooljo6e2.pdfIn PDF document text
    • https://cdn.sqhk.co/konafomaz/jc1hcK2/jepiwurilefete.pdfIn PDF document text
    • http://mugurapit.sportsontheweb.net/12119518789.pdfIn PDF document text
    • http://insurancecarusa.com/32769169502woiek.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/cic2Ygg/oceanhorn_2_review_ios.pdfIn PDF document text
    • http://rolapisi.scienceontheweb.net/36412741206.pdfIn PDF document text
    • http://endi-itali.space/87446625003zfhir.pdfIn PDF document text
    • https://cdn.sqhk.co/vamunidibu/iaigeFm/laladopux.pdfIn PDF document text
    • https://cdn.sqhk.co/difejekexe/Agcjcgd/commander_collection_green_pre_order_uk.pdfIn PDF document text
    • http://carinsusa.com/kowodosarimevwen1j.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopaji/cgghjQc/zejurojabogidab.pdfIn PDF document text
    • http://tosety.xyz/zte_z288l_hack7gpkx.pdfIn PDF document text
    • http://kafujaguvo.mygamesonline.org/aloha_oe_piano.pdfIn PDF document text
    • https://cdn.sqhk.co/vobilurerire/iiihQ01/podixijemus.pdfIn PDF document text
    • https://cdn.sqhk.co/jusulikipe/vhcVjMZ/farosezop.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugavu/hbgjibR/farm_heroes_super_saga_not_loading_on_facebook.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/7657d5a3-694e-416d-a16c-5c6657c1d823/how_to_make_a_childrens_toga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76d4621a-756c-4735-8a0f-2a3f2deeaab0/was_there_a_sports_illustrated_swimsuit_issue_in_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7cf6b95-aa43-4e57-bed0-f8dc334e3893/jikej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9419236a-ec03-45c7-9ec4-e1121e07cd4e/romusazisulu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20f38adf-d340-410e-8300-36267ec48c67/what_is_the_best_free_grammar_checker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a90d973-e5d2-41c2-870f-df5f85be3169/vixokafaloweja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/283e21a4-4ed3-4dc9-9089-43ea6be85abc/juwerinim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/709803d7-1462-4366-af8e-2d0e885cb138/descargar_traductor_espaol_portugues_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57df6188-9b53-41d1-bcb9-2a06cb33d586/xubidimefid.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_off0000f737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF737 5408 bytes
SHA-256: 95125eb2875739515b0d4584704d7989d4a7c1e0aa3f28d870d98bf55b7a8875
font_01_sfnt_off000109be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BE 12052 bytes
SHA-256: 311a1cfa14927c7d990eacf9186b71368d06e9165739cabf57f34b6cffd3ad2e