Malicious PDF — malware analysis report

Static analysis result for SHA-256 effd4e0611d11cc6…

MALICIOUS

PDF

75.5 KB Created: 2021-04-02 18:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89643dd6827c7efa8b05b1272f28fdc3 SHA-1: a581ab8ec0d6687ac4131668ab1d5afc0270ff02 SHA-256: effd4e0611d11cc6fd7143af7550c15ec1822a9777dcad5c0866be0a7c55a1c7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. It contains numerous external links, suggesting a link farm or phishing attempt, with one URL specifically pointing to a potential malware download. The document body, though truncated, suggests a lure related to study guides, aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/wix?keyword=mythology+study+guide+questions+and+answers
    • https://gixisisopovi.weebly.com/uploads/1/3/4/7/134713576/bivigafuga.pdf
    • https://cdn.sqhk.co/viliwogid/jejijh9/92926925879.pdf
    • https://cdn.sqhk.co/letarezetap/CDWhbqq/bamogapewinifusofenarilog.pdf
    • https://cdn.sqhk.co/pijavagoke/fEhahb8/castle_of_illusion_xbox_one_code.pdf
    • https://cdn.sqhk.co/kulobibab/cFiVibm/dafuselazovekapejo.pdf
    • https://cdn.sqhk.co/vumivatuvi/d23iaCK/ultimate_epic_battle_simulator_mac_os.pdf
    • https://dofewomal.weebly.com/uploads/1/3/4/5/134510420/sefurulojonuf-losazo-kuverovovi.pdf
    • https://cdn.sqhk.co/tivanosox/enXFji5/5818488572.pdf
    • http://gikonifip.22web.org/gnese_allan_kardec.pdf
    • https://cdn-cms.f-static.net/uploads/4428052/normal_60241d9cdc56a.pdf
    • https://cdn.sqhk.co/pivoledofag/FhRZ5jg/iti_application_form_haryana.pdf
    • https://vowipolijej.weebly.com/uploads/1/3/4/7/134713390/69a828d.pdf
    • https://cdn.sqhk.co/baxajufim/brnIUja/anne_pro_2_keyboard_hot_swappable_switches.pdf
    • http://koxavafi.22web.org/alimentos_ricos_em_magnesio.pdf
    • https://rijopadanag.weebly.com/uploads/1/3/1/0/131070137/xijefunofikimiwobij.pdf
    • https://static.s123-cdn-static.com/uploads/4365608/normal_60048ab30f5f7.pdf
    • https://cdn.sqhk.co/ribafesupuro/ifcjiul/bottle_shooter_3d_game_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vajefam/performance_parts_for_honda_fury.pdf
    • https://s3.amazonaws.com/fasudikek/android_studio_specify_gradle_home.pdf
    • https://s3.amazonaws.com/tedowafomaru/1270148139.pdf
    • http://tigaxulajaju.epizy.com/books_free_sites.pdf
    • http://jewezoku.epizy.com/why_is_my_fridge_leaking_water_underneath.pdf
    • https://s3.amazonaws.com/dozore/free_editable_certificate_templates_word.pdf
    • http://ratotepuno.rf.gd/55267191028.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9cf.bin
a419a851ef3985b5929c148c632e310ea429fd8aa445a64a3d6c285c301867bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CF 5412 bytes
font_01_sfnt_off0000fc47.bin
30d7699d02b596ed2a1e3f1152f04e9621b1ea18e2765f838b418ee457045295		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC47 10616 bytes

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