Malicious PDF — malware analysis report

Static analysis result for SHA-256 bef81ed15b23986e…

MALICIOUS

PDF

76.6 KB Created: 2021-05-16 15:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 5582fa9b718de3aed6befbf6b55e651f SHA-1: 0a07fc7145abd29f70cb755d5e7d49a9f53349a9 SHA-256: bef81ed15b23986e8ae273b209891696d15439b53bf75da70e6be0bb04ef938f
124 Risk Score

Malware Insights

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

The PDF document contains embedded links that redirect to known malicious infrastructure, specifically a URL associated with a redirector. The document body, though heavily obfuscated, appears to be a lure related to setting up a remote control, aiming to trick users into clicking the malicious link. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=how+to+set+up+a+magnavox+universal+remote+mc345 In PDF document text
    • https://cdn.sqhk.co/givogaduta/jjikjeW/tudupusojikevelexivuvod.pdfIn PDF document text
    • https://cdn.sqhk.co/pobumepova/hdjjjKP/38653654512.pdfIn PDF document text
    • https://cdn.sqhk.co/gidufulelav/sji1tgg/50784187102.pdfIn PDF document text
    • https://cdn.sqhk.co/rowunozimop/eObTieX/jenexumusufomekowegejeri.pdfIn PDF document text
    • https://cdn.sqhk.co/kavatupopum/jagghji/25505851159.pdfIn PDF document text
    • http://lamejix.scienceontheweb.net/90342328182.pdfIn PDF document text
    • http://nakozek.mypressonline.com/kirowiwibiz.pdfIn PDF document text
    • https://cdn.sqhk.co/butuxolevu/NibQv7j/sofopanalutipolefol.pdfIn PDF document text
    • http://bejisosubonito.sportsontheweb.net/uppababy_vista_pram_rain_cover.pdfIn PDF document text
    • https://cdn.sqhk.co/nugopanage/jcgiijw/76293435133.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/2a162a79-2ac1-406e-a5a5-e8663234fc5a/what_are_character_strengths_and_weaknesses.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/28477606236.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b14bca95-b878-4ab0-a105-4ea0ebff8998/75210913630.pdfIn PDF document text
    • http://nizowozutagele.atwebpages.com/dopimekutozalemijefekodid.pdfIn PDF document text
    • http://kazaxeso.rf.gd/gasuwo.pdfIn PDF document text
    • https://s3.amazonaws.com/zategafozasiru/oecd_beps_report_action_2.pdfIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/bijli_movie_song.pdfIn PDF document text
    • http://lotitivixuji.rf.gd/what_is_a_metaphorical_reference.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6078c861-77bb-433c-9ae2-5432baf87a24/oreck_proshield_plus_air_purifier_reviews.pdfIn PDF document text
    • http://zorijefugixor.atwebpages.com/princess_diaries_2_cast_members.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/relacion_de_los_animales_con_los_seres_humanos.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_off0000eaeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEB 5812 bytes
SHA-256: 0cf5de04acb7ce02f3583947f71744d9c28fae48b4d86b0465f59ddf48aece66
font_01_sfnt_off0000feca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECA 11056 bytes
SHA-256: 48ac63ae75b8ea3e4a29a619db8b954441031553b685bdd5e268a5596e5c8bd5

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