Malicious PDF — malware analysis report

Static analysis result for SHA-256 40253f7a0c1d6da4…

MALICIOUS

PDF

80.8 KB Created: 2021-03-18 21:39:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de7be5ad9bfc9e62f40b86c92f831066 SHA-1: 1d401ce903230d6c5626ae2e8accc5aac1f5f1f2 SHA-256: 40253f7a0c1d6da425df853137a57b7954a45449cf8aba570b3ae453ab89bbac
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are SEO-optimized and point to other PDF files, suggesting a link farm designed to attract users searching for specific content like 'dragon ball legends apk download mod'. The presence of a critical ClamAV detection and ML classifier flagging indicates malicious intent, likely to redirect users to malicious sites or download unwanted software. No scripts were extracted, but the PDF structure itself is used to host a large number of external URIs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/wix?keyword=dragon+ball+legends+apk+download+mod
    • https://mupezoki.weebly.com/uploads/1/3/0/7/130739180/kitimuwokabusuk_tapuneluxon.pdf
    • http://viwavidif.getenjoyment.net/ciencia_y_tecnologia_en_la_sociedad.pdf
    • http://dikegebe.mygamesonline.org/6122630104.pdf
    • https://cdn-cms.f-static.net/uploads/4382790/normal_6049f69503ab9.pdf
    • https://nakalefa.weebly.com/uploads/1/3/4/5/134522788/mitop-fonivex-mujibezozine-vemala.pdf
    • https://menesifewo.weebly.com/uploads/1/3/0/8/130814293/guzufutagujoma_deminomujufu.pdf
    • https://cdn-cms.f-static.net/uploads/4403129/normal_5fd76c61b5f28.pdf
    • https://static.s123-cdn-static.com/uploads/4378170/normal_5fce47230a548.pdf
    • https://cdn-cms.f-static.net/uploads/4391611/normal_5fd71c19eba69.pdf
    • https://befawiboper.weebly.com/uploads/1/3/5/3/135389238/47d74e13a510d.pdf
    • https://lenapejasuma.weebly.com/uploads/1/3/4/7/134749539/3b210a890.pdf
    • https://jitebemaduk.weebly.com/uploads/1/3/4/6/134692965/7148927.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jevopemosod/samsung_bluetooth_keyboard_ee-cp905_manual.pdf
    • https://s3.amazonaws.com/pubopelej/69567733107.pdf
    • https://s3.amazonaws.com/susonanezaj/partners_in_performance_malaysia_address.pdf
    • https://s3.amazonaws.com/sorogamat/free_aerobic_exercise_steps_videos.pdf
    • https://s3.amazonaws.com/nufidibodudulad/zegerititemuw.pdf
    • https://s3.amazonaws.com/tikofaketonub/material_ui_dashboard_template_react.pdf
    • https://s3.amazonaws.com/votuweroxigezog/83142648697.pdf
    • https://s3.amazonaws.com/pusori/flight_pilot_simulator_mod_apk_offline.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2d4.bin
b3dfb2f2c41da7350fc3755141d2fd0ea5796bb125df25fec831093623ff73df
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D4 2900 bytes
font_01_sfnt_off0000fd17.bin
0f483215fc775b3cbb93fc2f2aa81cc3448432c96096287870d00095636b7158
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD17 5572 bytes
font_02_sfnt_off0001100a.bin
e10f519042f22c6ab74d53dd0a8d34fae9097109d2693c5082f1cfee474f5d23
pdf-font-stream PDF embedded font (sfnt) at offset 0x1100A 11000 bytes