Malicious PDF — malware analysis report

Static analysis result for SHA-256 836bc7cf149314ec…

MALICIOUS

PDF

121.1 KB Created: 2021-03-14 09:42:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4962398916d7b1d89900fc4c7e3de5ba SHA-1: cecc11f14ab46f81b98517625c2b781d42ad9146 SHA-256: 836bc7cf149314ecc0f6e9fc1d8dc3c4cdd21bf116baed74e13af8fd78586294
136 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it's a phishing lure, specifically using an image to redirect users to a malicious URL. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded URL 'https://resalured.ru/123?utm_term=jess+glynne+hold+my+hand+mp4' is the primary indicator of compromise, likely leading to a phishing or malware download page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/123?utm_term=jess+glynne+hold+my+hand+mp4 PDF link annotation
    • https://cdn.sqhk.co/zenekukera/i4Ljagd/12686640432.pdfIn PDF document text
    • https://cdn.sqhk.co/mugapowejog/9jahdhi/tornadoes_today_in_georgia.pdfIn PDF document text
    • http://rumafelaneli.mygamesonline.org/expired_polaroid_600_film_sx_70.pdfIn PDF document text
    • https://cdn.sqhk.co/tejosepu/ifXujc8/car_racing_helmets_for_sale_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/gupidiroka/Tb9suar/art_therapy_salary_monthly.pdfIn PDF document text
    • http://nimojojisox.22web.org/76465803445.pdfIn PDF document text
    • http://xafopawiki.medianewsonline.com/sql_for_data_science_edx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/film_editor_job_description_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/dosukiraruzesunanemef.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/povowigisisanemataxoso.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/82052264639.pdfIn PDF document text
    • http://gowepuxajotezo.onlinewebshop.net/devatapavukiloset.pdfIn PDF document text
    • http://wilirumam.rf.gd/34460890857.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/baaghi_2_movie_song_video_mp4.pdfIn PDF document text
    • http://gujimosodaza.myartsonline.com/rulogewitekuzisezenojumol.pdfIn PDF document text
    • http://fiforeru.atwebpages.com/is_rosemarys_baby_based_on_a_true_story.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/82491112235.pdfIn PDF document text
    • http://xolinupumilafud.epizy.com/tujovabufasunerolumuk.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/tetunibisudifiwizunewere.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
stream_002_off0000ec15.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xEC15 51788 bytes
SHA-256: b47071ef7d6f520f6a1502ae2014c4a5c05edaa867debe4d7fbc628c917fb4f9
font_01_sfnt_off0001885c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1885C 5456 bytes
SHA-256: 0ee7e77dd4166774710b3ac75f954685e6eceffd23efad7e6f33cdb5cb657ec2
font_02_sfnt_off00019ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19ACE 10600 bytes
SHA-256: d6a3a2fa82f5666bace8ee08f0129449e4aedac89085b1dd0c9dbfc61730bb3f
font_03_sfnt_off0001bf70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF70 16068 bytes
SHA-256: d7b25dc5f512836eb4e96674031d2352042d4610eccc34473d5b6aff049d846c

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