Malicious PDF — malware analysis report

Static analysis result for SHA-256 11ad0fdf5d471d25…

MALICIOUS

PDF

82.5 KB Created: 2021-03-15 14:27:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc51e99cf98e5cdef606ae11224455dc SHA-1: 4f17d9810496b00afa65acc0223625f86374fb84 SHA-256: 11ad0fdf5d471d25a2720e1f31b19edad690ac2aed6597d8e246c8839f49289c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, suggesting it is part of a link farm or designed to redirect users to malicious websites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the primary goal is to drive traffic to external resources, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/123?utm_term=rcb+anthem+hd+video+song
    • http://zisuroto.mygamesonline.org/abc_of_electrical_engineering_free_download.pdf
    • http://giwapozolaleg.mypressonline.com/tovideposeloxomafoxa.pdf
    • http://draiwenstore.online/20966338096swvlt.pdf
    • http://vowujebotoza.mywebcommunity.org/insinkerator_badger_15ss_3_4-hp_garbage_disposal_installation.pdf
    • http://mufutekuson.getenjoyment.net/68810367555.pdf
    • http://casser.xyz/can_i_use_my_ninja_as_a_food_processorbaam5.pdf
    • http://usesalle.xyz/formato_nacional_de_busqueda_de_personas_desaparecidas45ukq.pdf
    • http://rixujewo.getenjoyment.net/66319477946.pdf
    • http://zopokujejisolan.getenjoyment.net/power_flow_yoga_class_sequence.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_b3c679477b0543e59a40e17edbe80a43.pdf?index=true
    • https://s3.amazonaws.com/niporofez/alyson_noel_radiance.pdf
    • https://s3.amazonaws.com/vexosafugunu/20502029259.pdf
    • https://571cbd0a-ba82-408d-be6d-2df53a8fcfe5.filesusr.com/ugd/02af14_e55828515eb14f1091d19f8a16897b4a.pdf?index=true
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_8959b826e8324fd78a7fa09c2a9193e3.pdf?index=true
    • http://sadoboxijowem.myartsonline.com/60601943604.pdf
    • https://s3.amazonaws.com/vuforewebub/gambar_bergerak_untuk_power_point.pdf
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_ee1474b7a63942ada3944c01373f03f5.pdf?index=true
    • https://s3.amazonaws.com/tixedujegibex/nexokuxovolunufom.pdf
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_7f4d41865897427890663345e5fed9d7.pdf?index=true
    • https://s3.amazonaws.com/sowirutelevolur/sample_risk_assessment_report_for_office.pdf
    • https://s3.amazonaws.com/sasufufa/82411560144.pdf
    • https://s3.amazonaws.com/metakibeme/volinev.pdf
    • https://s3.amazonaws.com/kewakuko/13914383700.pdf
    • http://nojikigor.myartsonline.com/70408098736.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_off000102f3.bin
47bcd15a1c145c5213c4e13d893a5bc7ada3402a5e60cf76761678b4084feef0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102F3 5432 bytes
font_01_sfnt_off00011554.bin
11e2b3449d1797f363d9c2d96afb4e578964e3d5425fedc6c76f74a0f4d878a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11554 11708 bytes

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