Malicious PDF — malware analysis report

Static analysis result for SHA-256 b80273c7401dd0da…

MALICIOUS

PDF

75.9 KB Created: 2021-03-11 20:44:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 402d9d5a68a080a73668533443fdf5b2 SHA-1: 18b16f3259b53767d15baf2b34cdb92eacb1e011 SHA-256: b80273c7401dd0dab88df70811ed0429296bd25c1cce074fee76d273f07cdc9a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to disposable hosting, and one specifically uses a 'utm_term' parameter suggesting a phishing or scam lure related to 'brocade firmware'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the idea that this PDF is part of a link farm designed to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pelibifir.ru/123?utm_term=brocade+firmware++single+mode+option
    • http://kaforij.22web.org/87557190534.pdf
    • http://nipizakevenuvis.scienceontheweb.net/10_steps_to_successful_breastfeeding_ppt.pdf
    • http://pufivuziviv.mypressonline.com/xasul.pdf
    • https://cdn.sqhk.co/pelemobi/LEDqZhg/hitman_sniper_assassin_pc_download.pdf
    • http://jotipire.iblogger.org/sosurulojisederugotilimu.pdf
    • https://cdn.sqhk.co/tokebamojos/iQ1Weid/yellowstone_kelly_reilly_season_4.pdf
    • https://cdn.sqhk.co/mugegiduveb/j1qBzpF/at_t_u-_verse_modem_setup_guide.pdf
    • https://cdn.sqhk.co/texafikogot/DgjdH1e/sims_4_art_of_magic_mod_2019.pdf
    • http://livunopewopo.iblogger.org/zonajuverojakuworon.pdf
    • http://wokulorumal.iblogger.org/20605014404.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sawesupunozigiv.atwebpages.com/tiniretejola.pdf
    • https://9d1e48ad-bcd7-4831-9b7b-7108443a63b6.filesusr.com/ugd/136d07_9015a866de4540c3a96da8126d8c8482.pdf?index=true
    • http://novosumagib.epizy.com/free_printable_algebra_worksheets_for_grade_8.pdf
    • https://uploads.strikinglycdn.com/files/0366bc39-b8c4-4aef-9785-c6e313dc391c/jeep_wrangler_manual_transmission_replacement_cost.pdf
    • http://kenesowozowojaw.myartsonline.com/wave_warrior_sonic_exe_2_light_version.pdf
    • https://uploads.strikinglycdn.com/files/a504e4e2-84ba-4c98-af82-8228dcc75272/5870468526.pdf
    • https://d046670e-94b8-4ea2-8efc-69fca9b502c9.filesusr.com/ugd/c0b427_ee818052ac1645b79460174f1c0624a1.pdf?index=true
    • http://kojaburu.epizy.com/19924345383.pdf
    • http://wejajesenopezoj.onlinewebshop.net/winenunurumuwewadunedog.pdf
    • http://kiralemosokeze.epizy.com/77748596623.pdf
    • https://uploads.strikinglycdn.com/files/bd54f144-1f8a-4219-8cce-0393607181ec/76168095758.pdf
    • http://keluwuvofaj.epizy.com/dsm_5_criteria_for_antisocial_personality_disorder.pdf
    • http://rileponabamel.rf.gd/vufipepokagesusobuwig.pdf
    • https://7b4e975e-109f-4397-a679-93e438ff1453.filesusr.com/ugd/c33f71_aa8070b61a474e2e956f20262bae4d41.pdf?index=true
    • 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_off0000e9e4.bin
a2144b7be5e370786e5bba718179abfecd09011a22c5855ec7b5f127e21e3161		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E4 5616 bytes
font_01_sfnt_off0000fcfe.bin
29a6c25c63e5b937688d5931195cea6beef2410c4ef55ccd7c2d7bc458f42409		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFE 11120 bytes

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