Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e2485915cbe44a8…

MALICIOUS

PDF

75.9 KB Created: 2021-03-22 16:55:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efbff5b949f1fd6ea45475bdbea5c671 SHA-1: d1c20061bae40b86fc8aa9af4df5e57f9a5a7135 SHA-256: 6e2485915cbe44a83881acabe447d42bb5adde1afff25e404fc6f42aafa964ce
156 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which are likely part of a link farm designed to improve search engine ranking for malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The document body, though heavily obfuscated, suggests a lure related to 'computer applications final exam study guide answers'. No scripts were extracted, but the presence of numerous external URLs points to a distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/wix?keyword=computer+applications+final+exam+study+guide+answers
    • http://powuvomewekuxeb.getenjoyment.net/chiefs_schedule_2020.pdf
    • https://romudakon.weebly.com/uploads/1/3/5/3/135318284/3041868.pdf
    • https://livadasim.weebly.com/uploads/1/3/4/3/134312527/kudaweraruwawu.pdf
    • http://opros.xyz/353082901854eq13.pdf
    • https://selilanabos.weebly.com/uploads/1/3/4/8/134875664/dojumemiluvo_rojur_poletidagezuw.pdf
    • https://sajulivos.weebly.com/uploads/1/3/1/1/131164476/8424704.pdf
    • https://dusibijerike.weebly.com/uploads/1/3/2/6/132695870/6cd511.pdf
    • http://disozire.mygamesonline.org/forejedotajefobemow.pdf
    • http://subfamjtii.site/watch_les_miserables_online_free_putl1i54.pdf
    • http://joriwolujuf.sportsontheweb.net/game_where_you_guess_the_word_on_your_head.pdf
    • http://creditscoreusa.info/sawijupoturo91296.pdf
    • http://verifybadgehelp.com/tasiramuvukipaluzipomizubs5fwi.pdf
    • http://rixanemusijod.mywebcommunity.org/50877378823.pdf
    • http://aduo5.online/lesumif65ybi.pdf
    • http://hookup755.fun/71910290830o49ar.pdf
    • http://chambreop.xyz/4591401340xxcq8.pdf
    • http://instacopyrightcenter.com/video_games_online_store_canadasnhht.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d6d3a1c5-32ce-46e9-ae92-c5b8d84d65d9.filesusr.com/ugd/a3b54b_3cbf09b547fe4de5afcf1f598e0d64db.pdf?index=true
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_42a1ce9bff54457194cb531806dfe796.pdf?index=true
    • https://4cd5eafb-d261-4666-a528-29b55b1676c1.filesusr.com/ugd/8dde66_8e9f522d17b2445db5a7ec36f1086d61.pdf?index=true
    • https://f635e5d9-31b1-4f19-b758-7a623be10181.filesusr.com/ugd/6cf0f5_a1ee2a2bde654ce798eb2b714f9b7e96.pdf?index=true
    • https://c96d0889-97fb-4213-90a4-a08ae01970e6.filesusr.com/ugd/ed32f2_e037da5dafb345838d16011bf1423c01.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea8b.bin
42da4e51431ac4cdde1fe1b3776e39cc66e53c3be37cf898e6d22bd039406053		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8B 5644 bytes
font_01_sfnt_off0000fdc4.bin
6b05a0f44ab8253fb4eca7d29e40235610ead428a45314bf08ce5b40f7d94de2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC4 10592 bytes

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