Malicious PDF — malware analysis report

Static analysis result for SHA-256 54830c7cce8614d1…

MALICIOUS

PDF

79.5 KB Created: 2021-01-24 05:42:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 64723f2439c198cccc8fb0598d72a7f4 SHA-1: 76c6bfe0c4726bbeb93b618bb60675fae9faff7c SHA-256: 54830c7cce8614d1b1caa2ff7b99b637c4cd82a89f2119d0e3b79a3f858b3c5f
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The presence of a critical heuristic firing for 'PDF_SEO_LINK_FARM' and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure, likely delivered via spearphishing.

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 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.
  • 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.
  • 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://traffnew.ru/123?utm_term=miccai+2020+camera+ready PDF link annotation
    • https://cdn.sqhk.co/bepemuno/ihODhdw/vintage_bicycle_speedometer_installation.pdfIn PDF document text
    • https://cdn.sqhk.co/manuguwe/Ohjz0xG/33812537624.pdfIn PDF document text
    • https://cdn.sqhk.co/muxigatatini/8M09wgj/29728687966.pdfIn PDF document text
    • http://zepawagir.iblogger.org/blank_number_line_worksheets_year_2.pdfIn PDF document text
    • https://cdn.sqhk.co/ribegibonot/MahaiiK/royale_battle_craft_city_3ds.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/igAjjjt/among_lock_cydia.pdfIn PDF document text
    • https://notefusiwedamap.weebly.com/uploads/1/3/4/8/134872173/99eda07324a.pdfIn PDF document text
    • https://site-1166068.mozfiles.com/files/1166068/patwari_syllabus_rajasthan_2020.pdfIn PDF document text
    • https://site-1241632.mozfiles.com/files/1241632/administrative_reforms_department_haryana.pdfIn PDF document text
    • https://cdn.sqhk.co/sesexibanobu/hiPibn2/lubabenuzob.pdfIn PDF document text
    • https://cdn.sqhk.co/javeduner/uic9icM/xosajovefusunatikanevesi.pdfIn PDF document text
    • https://cdn.sqhk.co/kafufojugure/ewKgewP/game_server_control_panel_free.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/voxulija/bully_scholarship_edition_geography_3_answers.pdfIn PDF document text
    • http://zifopodisinuri.rf.gd/86579508802.pdfIn PDF document text
    • http://kevakop.epizy.com/bus_simulator_vietnam_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/i_choose_birmingham_emoji_answers.pdfIn PDF document text
    • http://xesidif.epizy.com/game_attack_on_titan_nintendo_3ds.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/install_apk_through_adb_command.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/45940627015.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_off0000fc87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC87 5256 bytes
SHA-256: c331f272a963ae330c1fa4330a8c6b8fdd19d9d7f8218cacb7abea84b95f3c05
font_01_sfnt_off00010e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E65 10064 bytes
SHA-256: d33bdbfce433c225cf3f0acb1f801bb80801dee9b64a83e0700a8ac683293684

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