Malicious PDF — malware analysis report

Static analysis result for SHA-256 f321df593f8cc121…

MALICIOUS

PDF

87.2 KB Created: 2021-03-20 12:39:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f4d0f27585cfe93007eec1d18f93fac SHA-1: 62da0ac902097de62f43e4fbcac4b895e6c65b43 SHA-256: f321df593f8cc121cbcd3bdb1a9e3505caec9c111cc92aba71606a005a1f4c22
96 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 point to PDF files, suggesting a link farm or SEO manipulation tactic. The document body, though heavily obfuscated, contains references to 'finding trigonometric ratios worksheet answer key' and 'wkhtmltopdf', indicating a lure to disguise malicious links. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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://kuzutuzo.ru/wix?keyword=finding+trigonometric+ratios+worksheet+answer+key
    • http://blue-tick-central.com/46122307571asdd4.pdf
    • https://bexejasofipa.weebly.com/uploads/1/3/1/3/131397997/vodomidalenuluf.pdf
    • http://sonoxusa.iblogger.org/candy_crush_saga_hack_2019_android.pdf
    • https://cdn.sqhk.co/zukasedu/lhjifha/download_castle_miner_z_xbox_360_completo.pdf
    • http://vipmanmarket.space/66981682162tek8t.pdf
    • https://cdn.sqhk.co/pinofizulag/xLhiidw/camera_app_for_iphone_11_pro.pdf
    • https://mavoxigomag.weebly.com/uploads/1/3/4/0/134096713/68b4d.pdf
    • http://copyrighytsupport.com/power_acoustik_pd-931nb_9.3kz88h.pdf
    • https://tavadubamik.weebly.com/uploads/1/3/4/4/134473349/305840673f767.pdf
    • https://dopovebo.weebly.com/uploads/1/3/4/4/134431975/1334874.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8f537467-136c-49a3-b61d-94c7228ab7d4/59572043922.pdf
    • http://ruvoluze.rf.gd/sivuxajutiponaderavedixun.pdf
    • http://tafikepuvanotu.epizy.com/taratozupibexogotonogiwam.pdf
    • https://0dd0cd87-80d3-4eb5-b9c6-73c43c3a6fca.filesusr.com/ugd/f0b6b3_b49fbdd6e4c347309d50a8c69fd49b42.pdf?index=true
    • https://3b044092-e341-4c69-a8e2-52b14fc1865f.filesusr.com/ugd/370021_98b1cd0d8bdc48f888932284e85fb855.pdf?index=true
    • https://7a579b3f-ce96-4c66-abdc-991530493d29.filesusr.com/ugd/010c6b_01524cc394264b368cc13f32ff716b62.pdf?index=true
    • https://uploads.strikinglycdn.com/files/632788fc-40a0-45d7-bae8-173a90e7e054/how_to_read_a_note_in_piano.pdf
    • https://uploads.strikinglycdn.com/files/c1431393-4f68-42a9-9352-95d93fc39710/the_collector_2009_filmweb.pdf
    • https://uploads.strikinglycdn.com/files/4c9053d9-3133-4ca0-be7d-ccc99a5dec3d/mercruiser_5.0_mpi_manifolds_and_risers.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd97.bin
f7cffa602b3ef008884e36e9a1ad896d6abb49a38027ce233a9f4c4794a4eb00		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD97 5532 bytes
font_01_sfnt_off00011056.bin
14a13b4ae3fe3a51e5e2cc6737c2bfc336b1aafbd967853616ac7d81a21635b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11056 12016 bytes
font_02_sfnt_off00013992.bin
281214d1119d96f3a8ebe36682ff3c94e77595198e0ed7d049f81fad77dcdf11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13992 16240 bytes

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