Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f28cc2e37c349a…

MALICIOUS

PDF

74.2 KB Created: 2021-02-28 15:38:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: bea9789b3c1266b158c2724479397340 SHA-1: fd77b7135cff457a5f0ca680cccae8be0dbf8d8c SHA-256: a7f28cc2e37c349abf23f6491c17c3d7a1a472c913ff68c8deeb077b17906831
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, likely intended to host or redirect to malicious content such as cracked software. The presence of a 'download button' heuristic further supports a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://midufefew.ru/wix?keyword=easytether+pro+apk+cracked+download PDF link annotation
    • https://cdn.sqhk.co/rapowipijes/Sgfgf53/rumble_in_the_jungle_book_online.pdfIn PDF document text
    • https://cdn.sqhk.co/memenewo/iefigjb/sunul.pdfIn PDF document text
    • https://cdn.sqhk.co/funixatugesi/1f1rKft/jivudog.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/who_invented_the_internet_wikipedia.pdfIn PDF document text
    • https://cdn.sqhk.co/wafasojudo/KhbghDj/wrestling_revolution_3d_wwe_2k20_mod_download_pc.pdfIn PDF document text
    • http://ruvujagefeko.mygamesonline.org/25163709151.pdfIn PDF document text
    • http://xatakafigudu.getenjoyment.net/15248115508.pdfIn PDF document text
    • https://linezeludamaxen.weebly.com/uploads/1/3/4/3/134340908/rugunabegufiwudevu.pdfIn PDF document text
    • https://cdn.sqhk.co/gukisafuw/ghugchc/skylanders_giants_starter_pack_unboxing.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/QWPibge/digital_marketing_strategy_mobile_apps.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/kakef/xupaza.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/watch_dogs_2_walkthrough_guide.pdfIn PDF document text
    • http://kivozusemu.atwebpages.com/pemevadok.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/jilitezu.pdfIn PDF document text
    • http://xakagigoneliv.myartsonline.com/how_to_hack_android_with_nmap.pdfIn PDF document text
    • http://roveramo.atwebpages.com/46017570873.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_off0000e6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BD 5376 bytes
SHA-256: 3cee7f4c40ee8ec9e9009ddfb3f727972ad0b18cfb48a1d896b7a338bf0b87ac
font_01_sfnt_off0000f91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91A 10196 bytes
SHA-256: 3b26fc8995d3d0c916ab55ad8b23ff4462d6ea3915c399d25ccfdeb8cdc15bca

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