Malicious PDF — malware analysis report

Static analysis result for SHA-256 536ad642b087b5b2…

MALICIOUS

PDF

73.0 KB Created: 2021-03-11 17:30:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f89644aa6bc1123bf9b3e448045889ab SHA-1: d7bb94b9cb2704420dabacdc1dbd04bdf765ad99 SHA-256: 536ad642b087b5b2660c364c9bd3ba62086ff77b82ab2253ed67f7efdd7f9fd0
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, with a specific example being http://egosikenclub.com/mepurikaj71oiq.pdf. The document body, though heavily obfuscated, suggests a lure related to 'ordinal numbers english exercises pdf', likely to attract unsuspecting users. No scripts were extracted, but the overall structure and link farm heuristic point towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://seumenha.ru/award?keyword=ordinal+numbers+english+exercises+pdf
    • http://egosikenclub.com/mepurikaj71oiq.pdf
    • http://fredo.bike/wasted_meme_formatrjrfl.pdf
    • https://cdn.sqhk.co/xasomegupur/jfjghit/green_ringtail_possum_evolution.pdf
    • http://natiral.space/english_short_story_books_for_beginnersreb2h.pdf
    • http://domen3.club/who_does_eadlyn_end_up_with70iz4.pdf
    • http://ses-paypal.com/21152475848rk9a5.pdf
    • http://zitokujamu.mypressonline.com/83412808070.pdf
    • http://ifeelgood.club/50088446384fn21z.pdf
    • http://cardioactiveufficiale.site/17742171614v3dw7.pdf
    • https://cdn.sqhk.co/loganidob/nlggaiO/vagodidasade.pdf
    • https://cdn.sqhk.co/viwedanej/yicibge/share_chat_helo_kannada_video.pdf
    • https://cdn.sqhk.co/tamenotu/icghgjW/aplicaciones_para_ganar_diamantes_gratis.pdf
    • http://springwin.space/233627034850zsmu.pdf
    • http://creamwalls.online/machinery_handbook_30thzyi3n.pdf
    • http://lamaded.mywebcommunity.org/85037165685.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://f6180879-d31b-499c-8e42-fead7842c491.filesusr.com/ugd/007227_3c1d7931e6044e99bafc914c29640228.pdf?index=true
    • https://ced6af22-cf5f-4df0-9cd6-2d424634d287.filesusr.com/ugd/3eed2b_3e3fcd11a04444a19f7356f39e0ee91a.pdf?index=true
    • https://a3c35cc3-4a3f-4d41-ab51-8b3e4b114d30.filesusr.com/ugd/2b25b5_732733007a004fd7a59bf9ff4a5265ba.pdf?index=true
    • https://7ec9ed57-df89-401a-953b-45744c150cee.filesusr.com/ugd/6e3131_920a2bab6dc44c5fb09a1e477dbb9807.pdf?index=true
    • https://8ab8d0a6-ebcf-4503-ac90-3c5d9a0926ce.filesusr.com/ugd/8585d4_34f6e2f0e7a740f2bc2569ff91c8c293.pdf?index=true
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_d2a4216b850148a9bc6dded52c73bc98.pdf?index=true
    • http://gozuketitara.onlinewebshop.net/sat_physics_subject_test_questions.pdf
    • https://d2faa26e-66ca-44cd-8f84-883624a71019.filesusr.com/ugd/dbbfd0_f26570cc62944276ad304a7d1f744195.pdf?index=true
    • https://94db4134-5784-44c5-a63d-963e509970fa.filesusr.com/ugd/9c58c5_6e013bd325684014a2e3d5809fbe3d4e.pdf?index=true
    • http://tivakifuzir.atwebpages.com/zavowelib.pdf
    • http://vekemelegewimo.atwebpages.com/tipos_de_comunicacion_humana_verbal_y_no_verbal.pdf
    • https://9534cc33-30dc-483d-bed2-8d5691710d48.filesusr.com/ugd/3835dd_7a580efcef62471a953c84e63896a61e.pdf?index=true
    • 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_off0000d165.bin
1e47746c4445766b0a6f010353492f24206c549a2e54b657ca06d131484674b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD165 5496 bytes
font_01_sfnt_off0000e3e2.bin
e848ad9276df82ed17c6d8a881a912a42608d7b3254b0d541a00b42e85e7525b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E2 10532 bytes
font_02_sfnt_off000107f7.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107F7 4324 bytes

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