Malicious PDF — malware analysis report

Static analysis result for SHA-256 62c627e4de774a6c…

MALICIOUS

PDF

72.9 KB Created: 2021-03-25 03:54:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 180b24770d967af70538f23fe87d53cf SHA-1: d54daab6e61e0209bfc0eec9d91a0581ecf68056 SHA-256: 62c627e4de774a6c28deee0eb16c785a1b96430ec28da75d18b8ef1557bf79c5
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm for SEO manipulation. It contains numerous external links, including one to 'https://nipisod.ru/123?utm_term=tabla+grados+fahrenheit+a+centigrados+pdf', suggesting a phishing or malware distribution lure disguised as a search result. No scripts were extracted, but the PDF structure and heuristics indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nipisod.ru/123?utm_term=tabla+grados+fahrenheit+a+centigrados+pdf
    • https://cdn-cms.f-static.net/uploads/4366989/normal_5fd6e3a9623af.pdf
    • http://kprovk.xyz/87325913057qp694.pdf
    • https://cdn.sqhk.co/wovupeni/bfha6oZ/tiktok_banned_in_us_update.pdf
    • https://cdn.sqhk.co/piwizogir/aJ8Omij/piano_keys_labeled_36_keys.pdf
    • https://cdn.sqhk.co/lisesemafo/wgjDjf4/renelavovagagute.pdf
    • https://cdn.sqhk.co/gidenateg/oifjgge/after_burner_climax_game_download.pdf
    • https://cdn.sqhk.co/fubafonu/hj7ibid/top_up_my_phone_ee.pdf
    • http://smcjd.com/minecraft_apk_android_sin_licenciamcpe9.pdf
    • http://monstergym.ru/756892416536kxiw.pdf
    • http://on-arenas.com/back-_on_discographyhkjpo.pdf
    • https://cdn.sqhk.co/lunosupi/yJajbgg/vavuz.pdf
    • https://nirereki.weebly.com/uploads/1/3/1/4/131483126/xukuv.pdf
    • https://tuzisufuga.weebly.com/uploads/1/3/4/4/134458332/7052196.pdf
    • https://cdn.sqhk.co/nevupediwix/NptT1jj/moto_racing_mania_mod_apk.pdf
    • http://waferaboteb.mypressonline.com/how_do_i_update_my_samsung_tablet_to_android_4.4.pdf
    • https://korenumotijele.weebly.com/uploads/1/3/4/6/134687452/29668f105949cc5.pdf
    • https://cdn.sqhk.co/fudopalizew/ieghRib/53619249584.pdf
    • https://cdn.sqhk.co/pawanipol/gvmiiOq/xolunukefudukosusaxije.pdf
    • http://yoptan.space/cuales_son_los_derechos_de_los_nios_y_nias3fywo.pdf
    • https://cdn.sqhk.co/vumuwuxa/hifibji/youtube_love_story_andy_williams.pdf
    • https://cdn-cms.f-static.net/uploads/4420448/normal_6028f15fb7d46.pdf
    • https://tiputanamadavok.weebly.com/uploads/1/3/5/3/135314880/a1d4d029c906a2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://povodakav.myartsonline.com/azo_free_certificate.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0dd.bin
004a07c0ddcb9334cf4a7656c09a8bc7007aa4aa55d479b6ae770011a713c730		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DD 5292 bytes
font_01_sfnt_off0000e2cb.bin
ff01dd6b9b1dccc8c8af063c68ea28018976ea6241ecb38b06ca4b1896edd876		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CB 11228 bytes
font_02_sfnt_off000107cd.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107CD 4324 bytes

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