Malicious PDF — malware analysis report

Static analysis result for SHA-256 52fb990c90f8ff86…

MALICIOUS

PDF

80.1 KB Created: 2021-04-01 23:06:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fdf2dfc4bcb60aa61a3c1e70e7124845 SHA-1: 51803b2af3da5baa3d77090725c0d80b3c38de06 SHA-256: 52fb990c90f8ff863f1eb38ce9692820d171d32b531cc986605073f732715280
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used to redirect users to malicious websites for malware distribution or phishing. The heuristic PDF_SEO_LINK_FARM specifically indicates a large number of external links, with one prominent example being http://roruvavaderej.epizy.com/79103803146.pdf. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

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://vilenefex.ru/award?keyword=encyclopedia+judaica+vol+15+pdf
    • https://static.s123-cdn-static.com/uploads/4383582/normal_6004cffcd083f.pdf
    • https://cdn-cms.f-static.net/uploads/4368735/normal_5fd377222bdab.pdf
    • https://cdn.sqhk.co/sevijeruba/h6iixje/game_dev_tycoon_free_download_ios.pdf
    • https://static.s123-cdn-static.com/uploads/4453338/normal_60084ec46afba.pdf
    • https://cdn.sqhk.co/somujatiza/idfiijf/where_to_get_bubble_tea_straws.pdf
    • https://cdn.sqhk.co/jivobukafon/tifahc7/52239293271.pdf
    • https://static.s123-cdn-static.com/uploads/4501364/normal_5fe04a4b34dda.pdf
    • https://sovopedu.weebly.com/uploads/1/3/5/3/135301682/jevatu-mevevenaxakor-lamaripetugag.pdf
    • http://manaluw.iblogger.org/avengers_main_theme_piano_sheet_music_free.pdf
    • https://cdn.sqhk.co/letarezetap/yziikgg/lutejufe.pdf
    • https://cdn.sqhk.co/wawabosamugo/phfjbje/best_car_driving_games_download.pdf
    • https://gitapobukelagij.weebly.com/uploads/1/3/4/2/134266265/833802.pdf
    • http://xizunamorazoved.iblogger.org/starfinder_dead_suns_maps.pdf
    • https://cdn.sqhk.co/wazikunal/2Sidhae/gevax.pdf
    • https://cdn-cms.f-static.net/uploads/4458390/normal_605bc143047bd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://roruvavaderej.epizy.com/79103803146.pdf
    • http://rozixan.rf.gd/sogijuzupe.pdf
    • http://jilawovo.epizy.com/infinix_note_8_lite_price_in_pakistan_2020.pdf
    • http://pemuvem.epizy.com/what_is_considered_middle_class_income_in_ontario.pdf
    • http://dipulitexaxuz.epizy.com/web_application_security_assessment.pdf
    • http://nevejekegasa.epizy.com/50561542639.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_off0000f642.bin
d25e5525cf231ebfe1265f0efab10727a61c2f60a0481c99911dec026a99a67e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF642 5244 bytes
font_01_sfnt_off00010857.bin
05870921f895c243354f97cb41bc46886ca93a649d43b5b21742641efcbe9960		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10857 13572 bytes

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