Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a76836ec61c843f…

MALICIOUS

PDF

76.8 KB Created: 2021-03-24 22:57:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: eaaa6427a08ff62853a634c986a62172 SHA-1: 0e85452a737d050f0e20a0e58865bc79b378632e SHA-256: 8a76836ec61c843f2368b8426d6ac4aa2d51f282a525fb3f0328fb1f8ca9c3de
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers as malicious. The document body, though heavily obfuscated, suggests a lure related to 'Acq 202 module 3 test answers'. The presence of external URIs and link farm heuristics indicates an attempt to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://leonvi.ru/wix?keyword=acq+202+module+3+test+answers PDF link annotation
    • https://revotilam.weebly.com/uploads/1/3/4/7/134732497/e51a6.pdfIn PDF document text
    • http://termometr-medikal.site/kitchenaid_slide_in_range_with_double_ovenxgqy0.pdfIn PDF document text
    • http://straponartist.com/98550719394u98qa.pdfIn PDF document text
    • http://hardcreditcheck.info/how_to_get_depth_in_drawingp22u7.pdfIn PDF document text
    • http://voirlo.xyz/mudomopizovaxemoxasimf4ph9.pdfIn PDF document text
    • http://nalodorepuwag.getenjoyment.net/teoria_da_aprendizagem_cognitiva.pdfIn PDF document text
    • https://cdn.sqhk.co/gusoguribus/2jDjb1h/steam_download_chromebook.pdfIn PDF document text
    • http://tiwimifozukimu.medianewsonline.com/realismo_politico_definicion.pdfIn PDF document text
    • https://cdn.sqhk.co/dolafita/hhkjjhN/music_90s_trivia.pdfIn PDF document text
    • https://cdn.sqhk.co/luwonowuwig/hbhbgAe/addons_for_minecraft_1._16._40.pdfIn PDF document text
    • https://cdn.sqhk.co/porodiwaten/hff1thi/cardiopulmonary_testing_guidelines.pdfIn PDF document text
    • https://zukinubugepar.weebly.com/uploads/1/3/4/5/134514864/4c02c0beba90d.pdfIn PDF document text
    • https://cdn.sqhk.co/kafekogi/hehgdhb/fall_guy_tv_show_theme_song_lyrics.pdfIn PDF document text
    • https://bujabofilurukok.weebly.com/uploads/1/3/2/6/132682168/142ab985f12.pdfIn PDF document text
    • http://sandwichhq.club/ram_dass_meditationqkmf9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://naxepedawizozet.onlinewebshop.net/lepuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dabd0d8c-1c72-4389-b375-3e1ff10f7c9f/what_does_600_mean_in_angel_numbers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93c2270d-c3bb-44a2-b9b2-794eb3c5f080/resumen_de_la_obra_el_amor_en_los_tiempos_del_colera_corto.pdfIn PDF document text
    • https://0e8f88b9-656e-4b05-9cd8-8bd477f85547.filesusr.com/ugd/95b9ea_f8c7bf89191f4ca4b4a6f791990a7634.pdf?index=trueIn PDF document text
    • http://jelomasulavi.atwebpages.com/padosozawivo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d0ed1fe-3517-437d-862c-1740cfd2da04/how_much_does_it_cost_to_replace_a_tankless_hot_water_heater.pdfIn PDF document text
    • https://7fca5364-97a1-4441-b76e-d2c429a59218.filesusr.com/ugd/735424_f9dc9fbdac55435da2832753acd47e4b.pdf?index=trueIn PDF document text
    • https://0df6220b-9630-4647-aab6-0d9db69b9d59.filesusr.com/ugd/8b97dd_5c0e90ce03ee4c36af130b0bc56315fc.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFA 5732 bytes
SHA-256: ef99627d05120cb8428eb819210b369960d8004e65d10312214776f255893076
font_01_sfnt_off00010074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10074 11048 bytes
SHA-256: 25f7785ae3d35d4635901fa3587698fb4beb5b2e4c86de711f495230fc98d257

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