Malicious PDF — malware analysis report

Static analysis result for SHA-256 c80c76a720a84d84…

MALICIOUS

PDF

70.1 KB Created: 2021-03-19 17:47:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b7d397c13337bc3e602fd2739ce26e3 SHA-1: 55194ecf41dc26fef0e42618ba9f94adfcdcc064 SHA-256: c80c76a720a84d84937d4394d4d7055526d73998e8e529d09ef159b46fc7eeed
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, indicative of a link farm or phishing attempt, with one URL specifically mentioning 'worksheet doc'. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/wix?keyword=radicals+and+rational+exponents+worksheet+doc
    • http://sibogufurab.medianewsonline.com/audio_visual_teaching_aids.pdf
    • https://cdn.sqhk.co/ritasuxa/69cdjhi/recarga_para_cuba_desde_el_exterior.pdf
    • https://vukekitap.weebly.com/uploads/1/3/1/4/131438073/4129110.pdf
    • https://diwapexag.weebly.com/uploads/1/3/4/4/134484560/kolususiwomofuw_beviti_peworexolopis.pdf
    • http://nekuwagibajese.getenjoyment.net/why_is_my_roomba_flashing_red.pdf
    • https://cdn.sqhk.co/nopavoboriru/8ZjcheZ/st_james_united_methodist_church_east_troy_wi.pdf
    • http://pazolozul.mypressonline.com/regik.pdf
    • http://padojobimo.mywebcommunity.org/lanetefi.pdf
    • http://gewututikame.getenjoyment.net/materi_akreditasi_puskesmas.pdf
    • http://kafidovomiguvo.mywebcommunity.org/veterinary_microbiology_lecture_notes.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lebaxa/jixofisifelopitoxiw.pdf
    • https://s3.amazonaws.com/tobobowu/fuvunu.pdf
    • https://uploads.strikinglycdn.com/files/da07aedd-6f8e-4ca8-bc29-b8e28bd21579/painting_with_a_twist_nw_san_antonio.pdf
    • https://s3.amazonaws.com/wopari/jogugizigepuvo.pdf
    • http://jukasuxoseki.atwebpages.com/21284714749.pdf
    • https://s3.amazonaws.com/mipizaju/application_letter_format_for_teacher_position.pdf
    • https://uploads.strikinglycdn.com/files/674656ad-47d4-4c46-9d77-d6198e79fb2c/number_theory_examples_integers.pdf
    • https://s3.amazonaws.com/jixeremipet/adobe_audition_cc_2019_kuyhaa.pdf
    • https://uploads.strikinglycdn.com/files/23a9298e-7175-4d37-8b09-541b794c895d/14693050845.pdf
    • https://uploads.strikinglycdn.com/files/37f300f5-944d-4c21-9666-c186c7fc49e4/42646711564.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_off0000d554.bin
2f7763ff1a5726283f2c84200a117fdc3f94c643b3ae352835a3a9e586049e0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD554 5392 bytes
font_01_sfnt_off0000e7be.bin
d37bb966177fe018090b4798f7dddc34e1bf54e091d829de6743d81b2776a153		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BE 10300 bytes

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