Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ea8a1f9cf69404f…

MALICIOUS

PDF

76.0 KB Created: 2021-03-14 15:40:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aec4ca0cb093cadce80440eb86f4288e SHA-1: 90c226565ee63fae0ec3762665722155fd79a835 SHA-256: 7ea8a1f9cf69404f86f87683d9324798b85b7ab2fce17d6c420feaa4b4088086
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malicious redirection scheme, likely leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://maypoin.ru/award?keyword=npa+and+basel+norms+pdf
    • https://cdn.sqhk.co/mafowixodi/jHSicic/gibefikibikiza.pdf
    • https://cdn.sqhk.co/govazofaj/Dhe4id1/simulife_life_simulator_games_pc.pdf
    • https://static.s123-cdn-static.com/uploads/4488092/normal_5fceb1c99a64f.pdf
    • https://cdn.sqhk.co/senuziker/arEdhfv/telepathy_meaning_in_malayalam.pdf
    • https://simisasokudu.weebly.com/uploads/1/3/4/2/134235492/9cc2c.pdf
    • https://nurinakeviwiket.weebly.com/uploads/1/3/1/4/131407921/pozuwuvaba-lobomivega.pdf
    • https://lulofaki.weebly.com/uploads/1/3/1/4/131453598/popidaze-fasedinesudod-givarelivuviz.pdf
    • https://static.s123-cdn-static.com/uploads/4393752/normal_5ff086f55e9ea.pdf
    • http://jigatinapa.22web.org/captain_marvel_coloring_pages.pdf
    • http://duvevonisupobav.22web.org/zanakigapagofur.pdf
    • https://cdn-cms.f-static.net/uploads/4367305/normal_5fdad4902e1c5.pdf
    • https://cdn.sqhk.co/nuxarufodir/ZjePKys/tiktok_banjo_song_3x_speed.pdf
    • https://cdn-cms.f-static.net/uploads/4460063/normal_600e9b1225212.pdf
    • https://static.s123-cdn-static.com/uploads/4500453/normal_5fef15a2722ba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9e61d3d0-ee2b-4d0f-a752-9aa0b0ac9e51/what_is_service_economy_supply_chain.pdf
    • http://dokozew.epizy.com/jiwowedunebu.pdf
    • https://uploads.strikinglycdn.com/files/a47215f5-219e-4f75-97e7-ae1ea8c0fe79/77877787154.pdf
    • https://uploads.strikinglycdn.com/files/82be5d13-3fe1-4c59-aebc-8c390b4c59a0/plantronics_backbeat_fit_3100_issues.pdf
    • https://uploads.strikinglycdn.com/files/056d2e40-ea67-4e95-8d48-a4cc534e9c37/health_psychology_definition_in_hindi.pdf
    • https://uploads.strikinglycdn.com/files/dad3d4ac-d54a-4bd8-8420-b2d879144d5f/sipejekaliv.pdf
    • https://uploads.strikinglycdn.com/files/55d189a2-f778-46d8-b1d8-72bdaf0238a4/fazapawunuwumeb.pdf
    • http://ziwufuv.rf.gd/chapter_5_infection_control_test_answers.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_off0000ec0b.bin
478d53cb599d1a9e0af8a4c3f02ff6acf5aa5367090d26803c88d5878aff6d3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0B 5296 bytes
font_01_sfnt_off0000fdf1.bin
b721a6e32caaa2c179d5d648368faa44898cea1c22de026a5e150a54446c147f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF1 10700 bytes

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