Malicious PDF — malware analysis report

Static analysis result for SHA-256 82a4d964d9c8aaa1…

MALICIOUS

PDF

80.8 KB Created: 2021-05-09 23:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4cf05af9ef8deafd4413330372db6bef SHA-1: cbdb24ed87c3813d25b1ccb807c0a17e12b6f012 SHA-256: 82a4d964d9c8aaa15ccc7c5b297f89fe085feacced344367ce16cc5383447d52
136 Risk Score
Tags
free-cdn-ebook-manual-lure

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 phishing or trojan threat. It contains a lure related to a polygon's exterior angle, which redirects to the suspicious URL https://vilenefex.ru/strik. This URL is likely used to deliver a secondary payload or conduct further phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://vilenefex.ru/strik?utm_term=what+polygon+has+an+exterior+angle+of+24 PDF link annotation
    • http://kutatofol.22web.org/lalewajobigal.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://s3.amazonaws.com/fumiposamisur/76668180706.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14ef9e27-2a44-485a-9d6c-bd0a15f340c0/child_support_phone_number_ga.pdfIn PDF document text
    • http://vijanemafe.rf.gd/barclays_ppi_form_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a384cb2-08f5-46a9-a635-ec95d45b80ce/north_indian_side_dish_list.pdfIn PDF document text
    • http://xozelabudizi.epizy.com/63142178691.pdfIn PDF document text
    • http://jomovexujufadi.epizy.com/waxodoluz.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/gulilokikelevifulewapo.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/asana_multiple_files.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/asuran_2019_bgm.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/tigagesuzokowulo.pdfIn PDF document text
    • http://gewapapis.epizy.com/jizanotefojekute.pdfIn PDF document text
    • http://mujigivufutufu.rf.gd/wuduberaziba.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/caesar_cipher_wheel.pdfIn PDF document text
    • http://diwomikutaz.epizy.com/descargar_bittorrent_pro_apk_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/what_is_a_good_synonym_for_captivity.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/67457576757.pdfIn PDF document text
    • http://fonaxipovun.epizy.com/32119508890.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c928102-9725-469c-a924-2a676db05c79/how_to_make_sparkling_mineral_water.pdfIn PDF document text
    • https://s3.amazonaws.com/falejogajir/89303368728.pdfIn PDF document text
    • http://futiwani.rf.gd/wuliradoxaf.pdfIn PDF document text
    • http://tusejuw.epizy.com/17734618570.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/zuzusogezoteriwi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E1 5356 bytes
SHA-256: f7e502696981c9aaad09a3deb718e041bff6a666102e492352ed1754f5e9dbe3
font_01_sfnt_off0000ea29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA29 11908 bytes
SHA-256: adce2e0a11f03bc3c0dd7e6bb63ea57d9e79c9fbd4ea98d5bcbedf9c1d0d303c
font_02_sfnt_off000111d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D1 16180 bytes
SHA-256: 8ef30eb595737c9edaf2600d9211bf461bc80de8fe90d2dd46013eb69bf7a81f
font_03_sfnt_off00012700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12700 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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