Malicious PDF — malware analysis report

Static analysis result for SHA-256 800227628012a0a7…

MALICIOUS

PDF

77.7 KB Created: 2021-03-28 20:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c94ccc94ea46de653df97d65ffae3b17 SHA-1: 8a3061dfbd8853ae0aefec5b1bf40afde62834ff SHA-256: 800227628012a0a7c55fa0209c26b159e7694924fe02a1960e334d591f2b0724
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

The sample was flagged by ML classifiers and ClamAV as malicious, with specific heuristics indicating it's a phishing lure for MFA or one-time codes. Numerous external URLs were extracted, many hosted on disposable domains, suggesting a phishing campaign. The document body, though heavily obfuscated, contains references to 'skout premium apk free' and application metadata, which could be part of a broader lure to trick users into providing credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://mezovuduw.ru/wix?keyword=skout+premium+apk+free
    • http://ueuniti.xyz/what_does_it_mean_to_be_a_marthaqacqz.pdf
    • http://jekenufakewe.mypressonline.com/30453392971.pdf
    • http://mavaxur.mywebcommunity.org/sisigutawek.pdf
    • https://cdn.sqhk.co/xatuxazaz/fhbiccE/48402934351.pdf
    • http://merotudonor.mypressonline.com/18670672542.pdf
    • http://alifan.store/22354750810ohpr2.pdf
    • http://turubegu.sportsontheweb.net/bk_coupons_2020.pdf
    • https://cdn.sqhk.co/tinodifozeza/ifjfhcK/solar_2120_wire_feed_welder_manual.pdf
    • https://kixakusafi.weebly.com/uploads/1/3/4/8/134891224/d721958a93.pdf
    • http://vostokzapad.su/fodirapikatuwadalolodiga1zaez.pdf
    • http://bewizasosu.sportsontheweb.net/bundobust_menu.pdf
    • http://hookup154.online/kofenoxovutelo1osic.pdf
    • http://fozakewugumomig.22web.org/five_night_freddy_characters_names.pdf
    • https://kaseloguxov.weebly.com/uploads/1/3/1/4/131406527/fobot-rarokewajudego-kasupi-sepedoroxafil.pdf
    • https://cdn.sqhk.co/gawagunikuw/SHqp0jf/coin_pirates_mod_apk_download_3._5._26.pdf
    • http://wupupetobuzune.22web.org/something_in_the_way_piano_sheet_music.pdf
    • https://cdn.sqhk.co/dedenijikal/iciavPw/manorama_calendar_2019_september.pdf
    • http://nitafibejuze.mygamesonline.org/effects_of_noise_pollution_on_animals.pdf
    • https://cdn.sqhk.co/letarezetap/CvgiczF/ragaduwojak.pdf
    • http://sopafekidis.sportsontheweb.net/hallelujah_chorus_lyrics.pdf
    • https://lononefebodamu.weebly.com/uploads/1/3/2/6/132696526/1404001.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fitagijup.epizy.com/jersey_mikes_subs_5_super_sub_wheat_wraps_recipe.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_off0000f50d.bin
e63862a132eaff65df00697599334eccd7535cfa1de4663c7e6bcbca54df9e03		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF50D 5004 bytes
font_01_sfnt_off00010601.bin
3af832f385948d227d2f965f38e3538d21f9195d884c6fbed960995aa3d897a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10601 10540 bytes

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