Malicious PDF — malware analysis report

Static analysis result for SHA-256 4051b8ff5ac4cb00…

MALICIOUS

PDF

162.6 KB Created: 2021-03-14 13:44:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f47fd061e9fedf9811862a731d05dfb7 SHA-1: 2806eb01d7315e684bab7314b5104b72bf195215 SHA-256: 4051b8ff5ac4cb007c0c96d10d3f6439225102e297f48f5a56e3fb1fc1825d94
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The document body, though heavily obfuscated, appears to reference a book summary, a common lure for social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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/strik?utm_term=13+reasons+why+by+jay+asher+summary PDF link annotation
    • http://wurogutevifo.iblogger.org/45271961525.pdfIn PDF document text
    • https://cdn.sqhk.co/wovovoteg/3EMziff/fejedejabukewipe.pdfIn PDF document text
    • http://werewinavif.22web.org/25403073400.pdfIn PDF document text
    • http://reassurez-moi-fr.info/xfinity_dvr_box_choicesmcixz.pdfIn PDF document text
    • http://xotuvezaramapez.22web.org/ambidextrous_organization_hbr.pdfIn PDF document text
    • https://cdn.sqhk.co/vogoxaginoje/eNigje5/18664116079.pdfIn PDF document text
    • http://sakipewo.22web.org/wexefamoxovatazotaboz.pdfIn PDF document text
    • http://f1l3download.site/does_apple_support_ipod_nanoq5sol.pdfIn PDF document text
    • http://appless.space/95221865042p72a1.pdfIn PDF document text
    • http://stickerrus.ru/fifegokatitofidom0a2p1.pdfIn PDF document text
    • https://cdn.sqhk.co/bewamufara/hHgiVm7/nolineb.pdfIn PDF document text
    • http://lorenbayi.com/rg316_coaxial_cable_data_sheetaxoz2.pdfIn PDF document text
    • https://cdn.sqhk.co/nawakema/jg1KJmI/gomezonafewuwozowe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://736f3f86-ac4a-4d06-be6b-3320275ea8ee.filesusr.com/ugd/cd27d0_b438d6a168e5404eb53ce58fe46adc89.pdf?index=trueIn PDF document text
    • http://xamuboba.epizy.com/15938653512.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16860a56-ea86-4648-a2a3-bcd301dfb7ce/the_andromeda_strain_book_plot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/519f9287-e54a-407d-837d-d7e0f098d5a8/lirr_huntington_train_schedule.pdfIn PDF document text
    • http://fibedul.rf.gd/ripamafejumabidaxigix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f89a325b-8ee8-491a-9649-8ee2f9a0c707/nuwapevokesomakuxexa.pdfIn PDF document text
    • https://2d2b1dae-c014-4902-97e6-c3f1d56915cd.filesusr.com/ugd/70e5f7_ea912dd170a349fd84f81be1a3ad05b5.pdf?index=trueIn PDF document text
    • https://4d75d3c9-3a4d-4df6-84ab-e48b83d723e5.filesusr.com/ugd/cdb50c_c0655733b7b545c98ecf5976780412cb.pdf?index=trueIn PDF document text
    • http://lelutipajeb.rf.gd/13679645606.pdfIn PDF document text
    • http://junorijuzijipu.rf.gd/81993525003.pdfIn PDF document text
    • https://7605d98d-8b17-4a41-9383-f5c8d5af9bcc.filesusr.com/ugd/2bed4c_abb367f7048743969bab9ea4b1669583.pdf?index=trueIn PDF document text
    • http://tukutuxobolekub.epizy.com/focusrite_saffire_pro_40_thunderbolt.pdfIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_c6b67961a598406e9041eea3d252c86a.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00022d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22D76 5424 bytes
SHA-256: 233343412d6be6c05f8d9b190c37d666248a2a0b33c44b41f3bc96e732fb42ad
font_01_sfnt_off00023fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23FDC 11632 bytes
SHA-256: 9ebf2222c77eb6ae84186745cba6830de282875a3a807de4f2b3464c35393724
font_02_sfnt_off00026755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26755 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90