Malicious PDF — malware analysis report

Static analysis result for SHA-256 3912d54c817a804f…

MALICIOUS

PDF

79.6 KB Created: 2021-01-23 12:34:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f111f7391f5b1fc2b70cb10a1788a383 SHA-1: eaa12b90e1905b4755b96bcb493c42898835e2ee SHA-256: 3912d54c817a804f7870fa412b8bb0d58ea180116a53b19251747ff8bf99a51a
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to distribute malware or lead users to phishing sites. The document body, though heavily obfuscated, contains references to 'tsum tsum land apk download' and the authoring application 'wkhtmltopdf', indicating a lure for potentially unwanted software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://trafffi.ru/123?utm_term=tsum+tsum+land+apk+download PDF link annotation
    • https://cdn.sqhk.co/pimidima/6bJiegh/tik_tapas_contactos.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuvedije/icYgdtQ/class_9_maths_ncert_solutions_chapter_14.pdfIn PDF document text
    • https://cdn.sqhk.co/midipumep/PuYBgjT/train_simulator_2019_all_trains.pdfIn PDF document text
    • https://cdn.sqhk.co/tidelefuzin/mbjgOgg/digad.pdfIn PDF document text
    • https://cdn.sqhk.co/sasuveze/igjfShg/singing_in_the_rain_cast.pdfIn PDF document text
    • https://cdn.sqhk.co/jufebarur/ljfjehw/81211038332.pdfIn PDF document text
    • https://site-1177793.mozfiles.com/files/1177793/raspberry_jam_recipe_with_liquid_pectin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371783/normal_5fd9b1127c163.pdfIn PDF document text
    • https://cdn.sqhk.co/kozuvurop/gdmghH8/bigoxemutigipexinanilofe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421611/normal_5ffa456041f71.pdfIn PDF document text
    • https://site-1172267.mozfiles.com/files/1172267/mogamomajubiponufu.pdfIn PDF document text
    • https://site-1246089.mozfiles.com/files/1246089/sentence_guidelines_endangering_an_aircraft.pdfIn PDF document text
    • https://site-1171725.mozfiles.com/files/1171725/pan_application_form_online_filling.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/zamuriza/anthem_bcbs_pre_auth_form.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/71250217485.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
font_00_sfnt_off0000dba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA1 2952 bytes
SHA-256: d8b907802410e675ceca2784509e58a9dae2947c1b2ad43e3e0c02687eabed47
font_01_sfnt_off0000e62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62F 5116 bytes
SHA-256: 9373624fe8466449c456e07bf73bd32ac0f4003feba7d55baf3a921577bf16d2
font_02_sfnt_off0000f794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF794 10632 bytes
SHA-256: 84a18cee1a71d84ee89a7c9b1d038e5b3a4f2b64c50fa31acd544691108467b5
font_03_sfnt_off00011c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C20 16128 bytes
SHA-256: 9fdaa680a232d796092d96ee5f75e418ead9c261e577746758f07b3f46e8d12d

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