Malicious PDF — malware analysis report

Static analysis result for SHA-256 d758f6f778a7ee56…

MALICIOUS

PDF

125.5 KB Created: 2021-03-27 21:03:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c988eef469017fe8d004e748c7d87279 SHA-1: 2076fb4c7b7c09c5ebae5478a6081f9e7c570b28 SHA-256: d758f6f778a7ee562da368bd0fe8fec700a388368ee48b700195324466d0bbb1
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to mimic search engine results. The heuristic 'PDF_SEO_LINK_FARM' and the presence of multiple unknown reputation URLs strongly suggest a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support the malicious nature of the file, indicating it's likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9023

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://vilenefex.ru/award?keyword=ceclor+suspensao+bula+pdf
    • https://cdn.sqhk.co/zupivikeg/fjfCia1/bluffton_weather_7_day_forecast.pdf
    • https://cdn.sqhk.co/xaselavub/aXgjZie/95658127204.pdf
    • https://cdn.sqhk.co/sofilita/iuqJfKE/masefawejamorudoveza.pdf
    • https://cdn.sqhk.co/tumowara/jiiblAj/29231472852.pdf
    • http://tells.fun/how_to_think_like_successful_leadersoi1cs.pdf
    • http://igme.site/how_to_build_a_basic_dog_housegpajr.pdf
    • https://cdn.sqhk.co/zubafena/jbjc7ic/37450258559.pdf
    • http://vzruvayarttraff.xyz/dinghy_boat_for_sale_philippinesxq1y9.pdf
    • https://cdn.sqhk.co/tinodifozeza/foYAjdQ/11045659784.pdf
    • https://cdn.sqhk.co/nakunadubux/iBhbgjd/turning_data_roaming_off_on_galaxy_s5.pdf
    • https://cdn.sqhk.co/wujakegu/dhbibh3/wigigosin.pdf
    • http://vuvuga.xyz/1693844144rn51i.pdf
    • https://cdn.sqhk.co/jixuvepabu/KAjgiiB/the_last_stand_union_city_cheats.pdf
    • http://detonic-italia.website/bun_hairstyle_videolbwux.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/90446ad7-08be-48b3-9181-c62b90681285/dabijurovuwutolo.pdf
    • https://s3.amazonaws.com/pazatuv/codigo_da_inteligencia_augusto_cury.pdf
    • https://5e54824a-8208-41b0-8aeb-7c017e8cfb46.filesusr.com/ugd/f64db8_1601aa96d1bd4ea180ca716b1e8b26ae.pdf?index=true
    • https://8a833fea-7c9a-4d2e-a5a7-d3590f42a3e5.filesusr.com/ugd/9aab09_c9c4aaea209f47a081e08adc43002809.pdf?index=true
    • https://d102a0f2-001f-4998-bb0a-88ac30ac05b5.filesusr.com/ugd/771ea4_308927535c35402286996c7f02d07295.pdf?index=true
    • https://s3.amazonaws.com/salade/apg_cash_drawer_manual_open.pdf
    • https://s3.amazonaws.com/kofabube/how_to_connect_logitech_bluetooth_keyboard_k800.pdf
    • https://s3.amazonaws.com/dojonuta/espen_guidelines_enteral_nutrition_critical_care.pdf
    • https://uploads.strikinglycdn.com/files/2ec60689-a1b6-4a8b-b745-3ee2996c9f8f/greenworks_2000_psi_pressure_washer_replacement_hose.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b431.bin
f71eb25472cadafd454e57aec94a852b3df38e63e0f6f4a6649cf5014200fea5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B431 5196 bytes
font_01_sfnt_off0001c5e2.bin
d922205a3e11958b7a085feeb0dbf18c2c1b63eb3985567111fc3948c9454f4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C5E2 15004 bytes

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