Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1c1ad8ee20a52ae…

MALICIOUS

PDF

82.2 KB Created: 2021-04-16 00:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7c19055a41516a98fece1e0011d0212 SHA-1: 6896b3094645dd6a1a0222f09b861ebe13c732a2 SHA-256: c1c1ad8ee20a52ae5203fb104655e6e38e45a06d0601356a7039f7f46515ee53
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to Weebly-hosted PDFs and other domains, indicative of a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URI heuristics point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=fat+loss+workout+schedule+pdf
    • https://bagerinev.weebly.com/uploads/1/3/1/6/131636948/gegamot.pdf
    • http://xivobivivupe.mygamesonline.org/situational_approach_to_leadership.pdf
    • https://vakakarixo.weebly.com/uploads/1/3/4/5/134590502/773bd21.pdf
    • https://mavabebuvaxar.weebly.com/uploads/1/3/0/8/130814237/jamodijaka.pdf
    • https://nemabofafuz.weebly.com/uploads/1/3/5/3/135389169/wavudovuk.pdf
    • https://meligobuv.weebly.com/uploads/1/3/1/0/131070858/fawosivibezo.pdf
    • https://taxupati.weebly.com/uploads/1/3/4/8/134891344/rumezoke.pdf
    • https://kapalane.weebly.com/uploads/1/3/0/9/130968981/5be82b6e021888b.pdf
    • https://fedonofawok.weebly.com/uploads/1/3/4/8/134881994/xidulepek-zixur-selanixal.pdf
    • http://wotidoteked.mywebcommunity.org/oxford_bookworms_library_download.pdf
    • https://xinusikavafomi.weebly.com/uploads/1/3/4/3/134353784/retimuvek_bikawalanawate_dabikise_lopunemidalidas.pdf
    • http://dufifudusimube.mygamesonline.org/sibigiwovivinumepu.pdf
    • https://favonewe.weebly.com/uploads/1/3/2/6/132695639/sebotoram.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tonisefoteka/asus_p8z68-v_lx_bios_flash.pdf
    • https://s3.amazonaws.com/mujevubutukoxu/informerande_text_mne.pdf
    • https://s3.amazonaws.com/libusamagowuvo/4moms_pack_n_play_bassinet_insert.pdf
    • http://radikabo.rf.gd/rijufusefirimufoxaxupuru.pdf
    • https://s3.amazonaws.com/wikurixobelu/ponidozoviwibanovu.pdf
    • https://s3.amazonaws.com/jutenojamega/rulititamedilunipilevij.pdf
    • https://s3.amazonaws.com/senodiw/blue_is_the_warmest_color_full_movie_download_in_300mb.pdf
    • https://s3.amazonaws.com/sixenogafopoj/poxidezunago.pdf
    • https://s3.amazonaws.com/vofadoloves/pigoduresu.pdf
    • https://s3.amazonaws.com/jopomodilamego/premiere_pro_14.0.1_download_mac.pdf
    • http://rusavuwirajul.rf.gd/bios_password_removal_tool.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_off000102c2.bin
3e5e1c7f4b912a5c74780057362ecf02236335086c24eb31d9cacb1b088ef3d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102C2 5352 bytes
font_01_sfnt_off00011507.bin
2934fa341167926add158383723f747f7acffd55b863156871b59d52f585d0c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11507 10992 bytes

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