Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8a6c0e1baedd15a…

MALICIOUS

PDF

89.4 KB Created: 2021-03-06 04:11:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c2ffb6e2480cef2ce8f5890b387e0b93 SHA-1: f18e69e942021d23b93a421466367ad9417d413c SHA-256: b8a6c0e1baedd15a0472c58119104b682675239820327dd1563318ef9a370c7c
126 Risk Score

Malware Insights

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

The PDF contains an external URI pointing to a suspicious domain, which is also flagged as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate maliciousness. Although no scripts were extracted, the presence of a suspicious URL and the nature of the PDF heuristics suggest an attempt to redirect the user to a malicious site, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/123?utm_term=what+order+does+diary+of+a+wimpy+kid+go+in PDF link annotation
    • https://cdn.sqhk.co/wibononuve/jhahpjc/6967810888.pdfIn PDF document text
    • http://matalake.22web.org/koverazebugukovegi.pdfIn PDF document text
    • https://cdn.sqhk.co/wujamufaw/dFUIsgh/kuredo.pdfIn PDF document text
    • https://cdn.sqhk.co/xidatelo/PPXnsgf/vintage_race_car_games.pdfIn PDF document text
    • http://widokig.iblogger.org/synonyms_of_spreading_information.pdfIn PDF document text
    • http://fomilexavekol.22web.org/dyson_animal_vacuum_replacement_parts.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/a0e5d28a-e70e-439b-91f1-1bce001e5496/replace_filter_on_robinair_34788.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c76606c-3376-4423-ae6f-f89ce6b9d17e/sullair_compressor_service_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b7ff8a1-5952-400f-b9da-a4954f0529e0/19713372085.pdfIn PDF document text
    • http://romipozaxijida.rf.gd/bofibomekojarafimapezo.pdfIn PDF document text
    • http://vamuxusonepuf.rf.gd/10331214424.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/volagib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6de98284-9e52-4426-84c8-bdd634dec265/los_mejores_libros_de_economia_para_principiantes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e6a7f78-803f-4a1c-a91d-a17965644634/sherlock_holmes_1_tamil_dubbed_movie_download_in_isaidub.pdfIn PDF document text
    • http://vunewidetovufeg.epizy.com/suvane.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/class_10_political_science_chapter_1_in_hindi.pdfIn PDF document text
    • http://tudegelufer.rf.gd/wunemoparedaj.pdfIn PDF document text
    • http://remagemutadaf.epizy.com/42407302523.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/rilanawimiruwidotix.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/agastya_film_hd.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_off00011aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA9 5696 bytes
SHA-256: 8df28bd173c7aa751d82a32def9f4a35ca8a22d679263ae1c02c3075f4f58527
font_01_sfnt_off00012e00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E00 12248 bytes
SHA-256: 62251137bdc4ee43ba6a1712decac4386abd45055eb62ebefc8366daadfee618

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