Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcbf834df3fd4ff0…

MALICIOUS

PDF

114.6 KB Created: 2021-02-24 14:16:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: a014b40bec3aef5dcbd91ca41bcb4e32 SHA-1: 88bf6fbdf522433a7435aefc792c7fc05470d453 SHA-256: bcbf834df3fd4ff03093817d7b3dccf971bdbf069169ded55df1411179613dec
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with at least one pointing to a domain associated with link farming and disposable hosting, suggesting a phishing or malware distribution scheme. The document body, though partially corrupted, contains keywords like 'audacity definition' and 'award', likely serving as a lure to entice users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9668

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/award?keyword=what+is+audacity+definition PDF link annotation
    • https://cdn.sqhk.co/nuditufu/bdljcMJ/msi_stacked_stone_colors.pdfIn PDF document text
    • https://cdn.sqhk.co/mewivupa/d3qnyZZ/ultimate_fishing_simulator_vr_dlc.pdfIn PDF document text
    • http://blekrossi.ru/beliwonenabown5bvl.pdfIn PDF document text
    • http://copyrights-notices-helps.com/99061358495rvzil.pdfIn PDF document text
    • http://remontnatali.ru/piping_isometric_drawing_filebgzo3.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwewiwudesi/iaxibtb/56951938226.pdfIn PDF document text
    • http://mynasert.online/86331449488e6k8m.pdfIn PDF document text
    • https://cdn.sqhk.co/somujatiza/mxaiaoo/60400402947.pdfIn PDF document text
    • http://snegny.com/appraisal_answers_uks0rs0.pdfIn PDF document text
    • http://study-english-05.site/nizikunkd6tg.pdfIn PDF document text
    • http://specrazreshenie.com/74328895279fud0m.pdfIn PDF document text
    • http://organic-ita.space/harry_potter_2_online_film_zadarmoo6ysv.pdfIn PDF document text
    • https://cdn.sqhk.co/gikunixa/je2Xjce/matozafosetavilo.pdfIn PDF document text
    • http://pressit.space/clapton_coil_ohm_guideoyqsy.pdfIn PDF document text
    • http://gaydating.world/android_notification_icon_showing_white_squaremoom6.pdfIn PDF document text
    • http://probkin34.xyz/jogegagodiworazutagcn5qe.pdfIn PDF document text
    • http://antonioita.fun/motuwozeminilizakujotuzozwb7xl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://rajixubododafu.epizy.com/anatomy_of_brain_free.pdfIn PDF document text
    • http://jomovexujufadi.epizy.com/jquery_ajax_post_data_form_serialize.pdfIn PDF document text
    • http://nifukugobu.rf.gd/xagiriwugopodaxojemiwiwaj.pdfIn PDF document text
    • http://biwodonugawodil.rf.gd/alabama_administrative_office_of_the_courts_forms.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 10

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_009_off00017ac6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x17AC6 19536 bytes
SHA-256: 42fa3434756fcf156b83e33c9faa4d66671c354bc9cf3461de0854395b428fa9
font_00_sfnt_off0000f189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF189 5816 bytes
SHA-256: b88f5dafe4472f39e3aad87dac4e84fd982ae3031d5ab00d8208822c22e8517b
font_01_sfnt_off000105c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C5 4980 bytes
SHA-256: 0c85e4165760cf3d6515f5c7dea01362421d3e90f6a62da0c623eb9d62590ff9
font_02_sfnt_off000116b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B3 2656 bytes
SHA-256: c206ac4eca120f096112d408dff6b33a2f721090936d80486df636e1cd240fde
font_03_sfnt_off000121b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B9 2328 bytes
SHA-256: 3702365b3034b9d7945da23b991b5e2ac3f8bb06d1ba3be7e5ba1b5d8dd48c9f
font_04_sfnt_off00012c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C70 2108 bytes
SHA-256: e66bd646ff29f48b94a898642357a1d5295b77faffa0bd70eb77acb4aebc9a97
font_05_sfnt_off0001363c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1363C 6640 bytes
SHA-256: eca62b72654736461a635ba366d09d794777fd95c58152d2b251becdfce657e0
font_06_sfnt_off000147d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147D9 16564 bytes
SHA-256: eecb61b70d4882f499dda165bfbc200868f0251634d383857fc58e20eb4f072d
font_08_sfnt_off00019b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B69 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
font_09_sfnt_off0001a96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A96C 3852 bytes
SHA-256: 6c83e20e19a3a328bd8d64156f394943823799783e998c3fc92ed9a517b26f8d

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