Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b1614e5933878d6…

MALICIOUS

PDF

82.1 KB Created: 2021-03-17 07:49:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18d115b47cbda6c1549d7d3e717eccf5 SHA-1: 75c8b390d22263200d750ca5a1549e005daebf91 SHA-256: 7b1614e5933878d66480a51cabf54e3197f1a3a68076bdeaebe5b8010f321e3f
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to Weebly-hosted PDFs with numeric or generic slugs, suggesting a link farm designed to improve search engine ranking. One of the primary URLs, 'https://soxebez.ru/wix?keyword=download+apk+twrp+recovery', indicates a lure related to downloading Android APKs. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/wix?keyword=download+apk+twrp+recovery
    • https://gedorizifoxe.weebly.com/uploads/1/3/1/6/131607240/soxexixemup.pdf
    • https://kokilanoru.weebly.com/uploads/1/3/4/0/134012510/kiwiza.pdf
    • https://sunarikibuniteg.weebly.com/uploads/1/3/1/3/131381519/bojazonevakeviwaj.pdf
    • https://wonozonozosog.weebly.com/uploads/1/3/1/3/131398184/adb9371ae9a45.pdf
    • https://sujadomas.weebly.com/uploads/1/3/4/5/134526010/970720.pdf
    • https://fuwosijeven.weebly.com/uploads/1/3/0/7/130738701/nedebinonison.pdf
    • https://bofeliwibetu.weebly.com/uploads/1/3/2/8/132814086/6c5c05439.pdf
    • https://bodonoweti.weebly.com/uploads/1/3/1/8/131856710/2247652.pdf
    • https://ganivakolijovi.weebly.com/uploads/1/3/4/6/134666525/8b27cc.pdf
    • https://duxoberadu.weebly.com/uploads/1/3/4/7/134718286/runolenedejimune.pdf
    • https://fuzonigeli.weebly.com/uploads/1/3/0/8/130813785/ditexefolijure.pdf
    • https://tanuroxej.weebly.com/uploads/1/3/4/1/134131309/ramokunifezu_kururalikaler_wugidesukedorez_saxexupireb.pdf
    • https://xiluxobafuju.weebly.com/uploads/1/3/5/3/135323992/6296211.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/simujix/mtd_tiller_replacement_parts.pdf
    • https://s3.amazonaws.com/ninasivol/xijuveretu.pdf
    • https://s3.amazonaws.com/leteraxewe/learn_korean_book.pdf
    • https://s3.amazonaws.com/piwanisaj/subscribe_png_photo.pdf
    • https://s3.amazonaws.com/dikomavomem/bsn_ortho_glass_splinting_manual.pdf
    • https://s3.amazonaws.com/wifiduxezo/spider_man_ps4_dlc_trophy_guide.pdf
    • https://s3.amazonaws.com/zafijukopa/jexotufigenobi.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e422.bin
14ce451fbacaa1cfbc203f80c42883e912cf580ca2959a9c2e13700a293dc147		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE422 5208 bytes
font_01_sfnt_off0000f613.bin
d4696b847405d8b1ec42608a2007ea4083e1d37dd40214efd778fd8a30ffa57a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF613 15400 bytes
font_02_sfnt_off00012615.bin
0f592f62031d55fa1d0fb4718f5d067d1987426a283bb2ebc7a28ae7d8d4812e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12615 16080 bytes

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