Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0534a8f2db19d6e…

MALICIOUS

PDF

72.5 KB Created: 2021-03-18 08:10:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac3171c7fe0732e215be5d546d486de1 SHA-1: 5bdf062f73420694d937b064c95b4e1b0a0abec9 SHA-256: d0534a8f2db19d6eb7d6f395b0c4785784fe5cb0ccd5649b9999753185b18b36
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-themed and point to benign-looking PDF files, but one key URL leads to a suspicious domain. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://xezojetit.ru/award?keyword=ukulele+chords+pdf+file
    • https://xikisujegowo.weebly.com/uploads/1/3/1/8/131856166/37ca6f251b1a.pdf
    • https://cdn.sqhk.co/vixokezafafu/chfqigU/unless_exercises_with_answers.pdf
    • http://wegaturagifo.getenjoyment.net/agastya_samhita_english_free_download.pdf
    • https://cdn.sqhk.co/resesexiraf/ieibdyP/name_generator_for_boyfriend_and_girlfriend.pdf
    • http://melomone.scienceontheweb.net/59838249921.pdf
    • http://rigoditibalun.mywebcommunity.org/land_of_stories_movie_release_date_2019.pdf
    • https://cdn.sqhk.co/vozogekom/ichjgco/mevivoxalavemexapa.pdf
    • https://luvemolovod.weebly.com/uploads/1/3/4/3/134305721/335019.pdf
    • http://tuwuzesuwew.iblogger.org/setifu.pdf
    • https://pajilolupifi.weebly.com/uploads/1/3/2/3/132302794/8bc2c7d22eac.pdf
    • http://warixedivukinat.mygamesonline.org/vitamix_e320_costco_in_store.pdf
    • http://xuzevofut.22web.org/restaurant_employee_handbook_template_word.pdf
    • https://cdn.sqhk.co/sawibevas/jjLzzii/ticketmaster_presale_tickets_not_working.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zafaronivaj/aprendizajes_clave_primaria.pdf
    • https://s3.amazonaws.com/lekelepowo/gitabezaleb.pdf
    • https://s3.amazonaws.com/xijilesuzuxo/extent_report_dependency_code.pdf
    • https://s3.amazonaws.com/vixuwogetiv/bring_up_to_date_crossword_answer.pdf
    • http://nenilezum.epizy.com/board_games_download.pdf
    • https://s3.amazonaws.com/jiguwuzobozobaz/8197383285.pdf
    • https://s3.amazonaws.com/dojonuta/35933828452.pdf
    • https://s3.amazonaws.com/jepavilutabilel/32338665029.pdf
    • https://s3.amazonaws.com/gezetega/ligezosig.pdf
    • https://s3.amazonaws.com/lukepepe/wafekinakubawa.pdf
    • https://s3.amazonaws.com/baritexovopa/lexuwutoxugoxeta.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_off0000d694.bin
8965a6ca674d7eb1883d25ecdd31ea76c4b4f1537cba6a28ac4afb5e92eda482		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD694 5088 bytes
font_01_sfnt_off0000e7de.bin
daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DE 1800 bytes
font_02_sfnt_off0000f06c.bin
4d4b32e9b784d06365421523ae43c0120eab7dff7ab4d4bff3cbeec95f1fbd5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF06C 10468 bytes

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