Malicious PDF — malware analysis report

Static analysis result for SHA-256 53e90d0d5167d103…

MALICIOUS

PDF

68.9 KB Created: 2021-03-14 02:50:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac73691d10d50ec3b8009905f3201ad4 SHA-1: bcb8a26d0511b1a148d0c1f28ab2a913e7f6ea57 SHA-256: 53e90d0d5167d1033d114a71e78395ee39a9f53f6ad846236ed9cd17c3aad3a2
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, with the heuristic 'PDF_SEO_LINK_FARM' indicating a potential link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the presence of numerous external URLs points towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://xezojetit.ru/123?utm_term=antipasto+regular+font+free
    • https://cdn.sqhk.co/wafavalufa/0sgfibW/the_room_movie_2015_cast.pdf
    • http://salonhq.xyz/47896979894yjvq2.pdf
    • http://businessmentality.com/diffrents_types_de_contes4cdxc.pdf
    • http://tevfikyuce.xyz/folovujirh0qq.pdf
    • https://cdn.sqhk.co/wezikinupig/ulM1geM/vowewogoxonuw.pdf
    • https://cdn.sqhk.co/sepetuvab/iaF1Bii/rome_total_war_2_download_mac.pdf
    • https://cdn.sqhk.co/wuwovodegi/iLicheu/11795621575.pdf
    • https://cdn.sqhk.co/sofizagumup/n1igDNf/super_car_colouring_games_cars_coloring_book.pdf
    • http://virubedasiv.22web.org/ge_dishwasher_timer_knob.pdf
    • http://appless.space/324417815756d751.pdf
    • https://cdn.sqhk.co/kezomerameki/hhhiahj/81701052833.pdf
    • https://cdn.sqhk.co/koletexun/hchh0ZG/hd_cell_phone_space_wallpapers.pdf
    • http://dupomixu.iblogger.org/79821618899.pdf
    • http://daliadiago.com/114349616098388t.pdf
    • https://cdn.sqhk.co/fajoliteve/I91ja34/bodalopedovamuzoxutiwefi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xeziribosivamis.epizy.com/broadlink_rm_pro_manual_english.pdf
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_6a82df8161d840569855cb70e5d27415.pdf?index=true
    • https://68358877-4ee6-4e53-94f7-4bd9665c1f53.filesusr.com/ugd/3bbd68_01bc31e0952c4bcda584a1632734129f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7e2f10c4-4b3f-4429-be9b-08ce573e3ce4/flight_simulator_xbox_one_cost.pdf
    • https://c78267de-509c-4cb0-9394-6b21b7876e04.filesusr.com/ugd/290ce3_3b81823763a645a89774da236fd782a6.pdf?index=true
    • http://tumewadeb.epizy.com/bourdieu_forms_of_capital_1986.pdf
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_827d35c20c7943f0bdef6fb6dea69970.pdf?index=true
    • https://f98f40d2-b649-4e6b-99af-b89bbf2331ff.filesusr.com/ugd/724bd4_9cc5fea43a734a4981a5fff3c6656958.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5e752664-b1d1-4aa8-9317-cc3e10b4a380/7577286467.pdf
    • https://uploads.strikinglycdn.com/files/0d0133df-c7f4-4cc0-bbb5-59dec2b28f22/44551437083.pdf
    • http://zunerewema.epizy.com/samsung_wa45k7600aw_a2_not_draining.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_off0000cf93.bin
c2c1eb1d1c250981c8f482e9721647fffa984e182f5f70fce9db2c0dfb5dd5e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF93 5056 bytes
font_01_sfnt_off0000e0d7.bin
854accf4c38435dfba449f4668797e453f471dc5ad7ea0ad613cbea4dfefb3f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D7 10944 bytes

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