Malicious PDF — malware analysis report

Static analysis result for SHA-256 769f8a20c10e8ee7…

MALICIOUS

PDF

121.6 KB Created: 2021-04-29 15:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 960986237699299c4145010b77e25efa SHA-1: a91179166d6cdbc7f8867af76c6e9c1f4f56f098 SHA-256: 769f8a20c10e8ee74c850df5faeb7147701cdf72a2fca4fa6cf8c60cd3266602
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'link farm' designed for SEO manipulation. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document prompts the user to install a browser extension or update, a common tactic for malware delivery or credential theft. ClamAV detection and ML classification confirm its malicious nature, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://jumiwimov.ru/strik?utm_term=management+science+the+art+of+modeling+with+spreadsheets+4th+edition+pdf
    • http://dufigep.scienceontheweb.net/atropine_davis_drug_guide.pdf
    • http://xuzobinemipivor.mygamesonline.org/hallucinations_and_delusions.pdf
    • https://cdn.sqhk.co/pugudanirav/gejij8x/kutemafaxokokisezajagunig.pdf
    • http://tifoxikutawe.sportsontheweb.net/what_is_a_composition_english.pdf
    • http://kovamuwaropepu.getenjoyment.net/lifurorutizilejuvopipek.pdf
    • https://cdn.sqhk.co/dajebala/gEidEF0/62476769152.pdf
    • https://cdn.sqhk.co/pozigafo/jieghjV/xumipemukelokugeg.pdf
    • https://cdn.sqhk.co/ketadasogob/wFZ12he/zidewibixunutomasawosete.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/levovod/formal_shops_brisbane_cbd.pdf
    • https://uploads.strikinglycdn.com/files/2cd55951-d2ee-49e6-ab17-b490d4e48006/85577818652.pdf
    • https://s3.amazonaws.com/vukujidor/tobagavenadatitiwupifo.pdf
    • https://uploads.strikinglycdn.com/files/cf75535b-d884-40de-95f3-030fe24ddf93/sefepavilisunel.pdf
    • https://s3.amazonaws.com/ronatiduzoxij/tijiruvilodufikekege.pdf
    • http://suxudogakol.myartsonline.com/36387614248.pdf
    • https://s3.amazonaws.com/xujitezu/48314459548.pdf
    • https://s3.amazonaws.com/gapivegek/ielts_10_listening_test_3_answers.pdf
    • https://s3.amazonaws.com/vidadaviwal/81968336306.pdf
    • https://s3.amazonaws.com/vapelurowar/20847009393.pdf
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_4d03be899a4242bf9aae56cd677f57e2.pdf?index=true
    • https://2eeb51df-07ba-4372-80d9-1ef4646fc7f7.filesusr.com/ugd/6af210_155f92c539814491bddc6f4194f22924.pdf?index=true
    • https://877305ac-a74e-4e93-918f-f866ec7622df.filesusr.com/ugd/0dac30_9a64913294454efea7a817dcc69a9534.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a01f4438-bd7a-4ee3-ac53-13183cb04c49/kenmore_electric_range_element_not_working.pdf
    • https://9a4b5e96-23fe-4021-9525-787506808755.filesusr.com/ugd/b3318b_aabce947c95e49d98f61e669e8b3f856.pdf?index=true
    • https://s3.amazonaws.com/xidazeze/the_celluloid_closet_book.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019d90.bin
abc0cd40e67d99454a57894072ade12bce985997e98f20139b3ebedde851838d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19D90 5752 bytes
font_01_sfnt_off0001b125.bin
fd55760f3baa1125848b4a55e4b51d0aeec0b2c8f5e49b54a668378bb71cec81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B125 11612 bytes

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