Malicious PDF — malware analysis report

Static analysis result for SHA-256 1653484dbba00820…

MALICIOUS

PDF

71.5 KB Created: 2021-02-13 02:13:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6377afc9943f416602a4cb1bc9c7ed3 SHA-1: bf9801264983f79e8eb52ddd4ced0efdd85b82de SHA-256: 1653484dbba008208537783aea458ffc6e6383febaa7955f3f0b485ce1a8a170
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of numerous external links, with one prominent example being `https://newafiramolik.weebly.com/uploads/1/3/1/0/131070062/39da8b.pdf`. Another embedded URL, `https://jottigo.ru/wix?keyword=watch+nfl+redzone+buffstream`, suggests a lure related to streaming services. The presence of these links points towards a phishing or malicious redirection attack.

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-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://jottigo.ru/wix?keyword=watch+nfl+redzone+buffstream
    • https://newafiramolik.weebly.com/uploads/1/3/1/0/131070062/39da8b.pdf
    • https://cdn.sqhk.co/daxerarugak/ahhVPIH/zekebulimanugopizunixe.pdf
    • https://cdn.sqhk.co/numovasovev/0QCvjjU/vovenige.pdf
    • http://lolafoduluj.22web.org/columbia_river_fishing_report_august_2019.pdf
    • https://cdn.sqhk.co/tufuboloruj/6OifChb/67872871349.pdf
    • https://cdn.sqhk.co/zopinulepa/BuRgggf/putasidik.pdf
    • https://cdn.sqhk.co/posogamumut/ge5ibjb/ear_infection_drops_infant.pdf
    • http://rodigevofu.iblogger.org/kuvefugoguperewoxame.pdf
    • http://naturalik.fun/soluk_mavi_nokta_carl_sagan4lmij.pdf
    • http://usejus.pro/zupajulan70hlt.pdf
    • http://uuuuull.space/how_to_clone_a_sim_sims_4pjc3r.pdf
    • https://cdn.sqhk.co/matajikiwov/dhek7gc/sojolupuxufapesofoximu.pdf
    • https://gilurumujeluzem.weebly.com/uploads/1/3/1/8/131857598/xifumufiwufatexos.pdf
    • http://fherixq.com/ragnarok_mobile_merchant_alchemist_guidepccif.pdf
    • http://sotatetivula.iblogger.org/ptcb_study_guide_barnes_noble.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rovikejovejoto.rf.gd/53132705373.pdf
    • http://zerakunutage.epizy.com/phrasal_verbs_take_exercises_with_answers.pdf
    • http://kedokonox.rf.gd/realidades_2_capitulo_2a_page_36_answers.pdf
    • http://fapugiv.rf.gd/allah_allah_tarif_teri_hd_video.pdf
    • http://vajekalisafemun.rf.gd/futbol_tv_uzreport_dasturi.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_off0000c8c3.bin
2fa22fd0c054b95444bb79b7570efd620168d3ff686f509a21efd83f9ebbe0c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C3 5464 bytes
font_01_sfnt_off0000db40.bin
55fdd275b8be4d25a6cf16137a689414f1d0a1c52475a2db4c9b23cdec8edc77		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB40 9556 bytes
font_02_sfnt_off0000fbf3.bin
2906e013a2c12f8438753706de5a20d0a45d34478d649377d82f29cc76ae0543		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF3 16108 bytes

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