Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9082712147a237d…

MALICIOUS

PDF

76.9 KB Created: 2021-03-27 20:36:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 150bc40bf2c0f582b117ce8c0f59cdb4 SHA-1: 92f038d49008bf1555d67ae3509460c185497bf7 SHA-256: f9082712147a237d7cc31b52f22c33d4ce36cb6994f7c93258b90aa5073cf752
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, with one pointing to 'dafemum.ru', suggesting a link farm or redirection to malicious content. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to manipulate search results or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/123?utm_term=basic+arabic+words+with+english+translation+pdf
    • http://beautysale.site/metodologa_de_la_investigacin_tipos_de_conocimientolfbcd.pdf
    • http://freds.space/subnautica_where_to_find_kyaniteplexq.pdf
    • http://palitra-cveta.ru/fetanelufusexemimetixifut0grxc.pdf
    • http://dfwshootersupply.com/world_war_z_2_full_movie_online_123movieswpvm6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/padosumifubobo/96604590336.pdf
    • https://uploads.strikinglycdn.com/files/19a3de2a-324e-44de-8207-d22aa2c53dd8/murray_42_riding_mower_battery.pdf
    • https://s3.amazonaws.com/gekixadonuru/galofonavo.pdf
    • https://s3.amazonaws.com/rutufokedizon/free_english_language_worksheets_grade_7.pdf
    • https://s3.amazonaws.com/bamepofewalada/jupiniguvewudaduni.pdf
    • https://s3.amazonaws.com/ravuxudibure/xifubavuwonokibenuginezo.pdf
    • https://s3.amazonaws.com/gumagabu/tosudimuna.pdf
    • https://s3.amazonaws.com/lanaladu/spore_formation_in_bacillus_subtilis.pdf
    • https://s3.amazonaws.com/mivokozibu/upsc_exam_syllabus_in_marathi.pdf
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_a19eefc16c21473d8b65929c6417f8e6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/03c309cf-2d6b-4c8d-a179-4570048935dd/reparar_disco_duro_xbox_360_error_e68.pdf
    • https://s3.amazonaws.com/nedijowewoded/ledawogir.pdf
    • https://s3.amazonaws.com/kosamupim/excel_event_planner_schedule_template.pdf
    • https://39472683-7d43-4bc3-882b-0947a83fd973.filesusr.com/ugd/544c7e_6b999709f34c40d69212943a40fa3905.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7f507faf-5cc3-472f-a1ef-a7860b6afe1a/avital_4103_remote_start.pdf
    • https://s3.amazonaws.com/gezejoputiwinu/xujexume.pdf
    • https://uploads.strikinglycdn.com/files/fdfc6209-5692-48f8-a8a4-25606e26ecc5/3942223707.pdf
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_0d1c5c12f1144237b2d6d693a6f5c452.pdf?index=true
    • https://535a9070-e28a-464b-adc5-c02ad08be00b.filesusr.com/ugd/9df9d6_17977ac2817f4bdf90ee63d8a764990d.pdf?index=true
    • https://s3.amazonaws.com/tapelu/97137878325.pdf
    • https://a5a7f18c-b887-48a0-80cc-3627c14345d5.filesusr.com/ugd/609f59_86514dce9082411c847134f05acfb4eb.pdf?index=true
    • https://s3.amazonaws.com/wujixus/blender_2._79_addons_free.pdf
    • https://s3.amazonaws.com/rodigapigeta/39031896400.pdf
    • https://uploads.strikinglycdn.com/files/93eb94d2-1831-45ef-9887-f4e5691405dd/xoxederidapakifagotibaj.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_off0000ed57.bin
8b030d3e41822b8cd3215e85aaf0beb9bb590949b85eab7be19161d17bc9fb5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED57 5700 bytes
font_01_sfnt_off000100cc.bin
983056f3f7349a85d77ebf9808fd64a56cdaf0d9b9a46499fc5da89091626065		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100CC 11232 bytes

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