Malicious PDF — malware analysis report

Static analysis result for SHA-256 540846ca5a5c4d2a…

MALICIOUS

PDF

101.9 KB Created: 2021-05-11 17:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: fc0ba6ff32f298785ac3c8ce090a6bf4 SHA-1: e8380580e8ad6302e6c5b9b10f04130b2660dc71 SHA-256: 540846ca5a5c4d2a6778468b3402de904920d6a8faa5bd35c4b27d23a326828e
222 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a large PDF link farm. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to 'Amigo brothers story answers', suggesting a lure to trick users into clicking embedded links. The presence of numerous external PDF links, including one pointing to a malicious redirector, indicates an attempt to lead the user to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crophysi.ru/strik?utm_term=amigo+brothers+story+answers In PDF document text
    • http://lupazul.mywebcommunity.org/26916501788.pdfIn PDF document text
    • http://gomesuzos.mypressonline.com/los_anunnaki_completo.pdfIn PDF document text
    • http://posiximuteg.sportsontheweb.net/international_business_college_lubbock_texas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/362bff8d-9058-4bf0-b805-096e768a95f1/spectra_s1_vs_medela_pump_in_style_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/what_are_some_weird_city_names.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/you_are_the_universe_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/4591272381.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36e73de3-7bde-41bf-a0e7-1fae6b4222ef/58228239051.pdfIn PDF document text
    • http://kuxubakelixuzot.atwebpages.com/how_to_fold_up_total_gym_1000.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/90236847780.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfd6d0d5-4a0e-436d-8ac2-c923ea71d4cb/how_to_beat_gravity_on_earth_but_not_in_space.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/la_la_land_movie_synopsis.pdfIn PDF document text
    • https://2ac8321c-28d8-41c8-ac7a-99137a6fe030.filesusr.com/ugd/157ee0_d23a73e3082842ebb1f11a0958c57997.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b8ece4f-22e7-467a-bfc6-aeb2ff2af8fe/tp-link_powerline_adapter_tl-wpa4220_kit_av600_wlan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc4b2102-0260-479f-a4d8-d8a1ced4327f/19718131140.pdfIn PDF document text
    • http://baletax.onlinewebshop.net/39099362906.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/177e8b20-4025-4701-802c-61e1a0ea29a7/app_fr_jawbone_up_24.pdfIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/wixatumizurevezimis.pdfIn PDF document text
    • https://8eb0ff2f-1b5f-41fb-a82b-bf279dc7f43e.filesusr.com/ugd/868f76_6ad1410b61264a60b20898987b129fbd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9da9d1d1-3ed6-40e7-8034-62beb7b0ecad/rush_hour_2_script.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001131e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131E 6484 bytes
SHA-256: f2003bd783adf636ca2a0c67198fec0610ab8135d42dc0e34ee121178233cd54
font_01_sfnt_off0001232a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232A 5388 bytes
SHA-256: 63ab5b27583477b19e3f974c9bcce5fb1d2db962a430070e9380a45cd4a1cdba
font_02_sfnt_off0001356a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1356A 14356 bytes
SHA-256: 0e10447df340f18a7c2a62a48d5087083de0462b75d4e9e2090b2c2fe1199095
font_03_sfnt_off000164ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164CE 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd
font_04_sfnt_off000179f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179F9 6172 bytes
SHA-256: c6d619586a287bd68710f94e868286d436de000ced7b6029a9115c8fe925493a

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