Malicious PDF — malware analysis report

Static analysis result for SHA-256 553ca750fbd4ed64…

MALICIOUS

PDF

81.2 KB Created: 2021-04-01 11:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4feb663b75c4ee004c485f75ecda26b SHA-1: e3ee479846bad545b504e940bd22c2f65a24d82d SHA-256: 553ca750fbd4ed64783007d67238cc41b01c57db48fd7cae4b8dfc64888cb38f
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified by ClamAV and ML classifiers as malicious. The document body, though heavily obfuscated, appears to be a lure related to a medical condition, likely intended to trick the user into visiting the external URL for more information, which is a common phishing tactic. No scripts were extracted, but the presence of an external URI and the high confidence malicious verdict suggest a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 4

  • 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://dafemum.ru/award?keyword=aneurisma+disecante+de+aorta+toracica+pdf
    • http://mutujejeturuduf.medianewsonline.com/what_is_the_best_signia_hearing_aid.pdf
    • http://wopazav.22web.org/factory_reset_android_tablet_using_pc.pdf
    • https://cdn.sqhk.co/takodabu/cygfgdO/cure_the_incurable.pdf
    • http://poradoit1.site/alanyaspor_forma_rengiaom09.pdf
    • http://dipazekonowa.mypressonline.com/random_sampling_definition_in_research.pdf
    • https://cdn.sqhk.co/kugefiruxat/jgirMAJ/12501890535.pdf
    • https://cdn.sqhk.co/nupasoxure/gigihgD/sniper_master_city_hunter_mod_apk_rexdl.pdf
    • http://getcabinets.xyz/how_to_set_up_ultimate_ears_boom_32imh2.pdf
    • http://bluebadge-support.com/dragon_mania_legends_elements_guidejviox.pdf
    • http://rabejagoruwobol.66ghz.com/jagesemole.pdf
    • http://memowelubi.mygamesonline.org/8341798284.pdf
    • https://cdn.sqhk.co/zovogizosute/hhidhgL/63896698845.pdf
    • http://formverifiedbadge.com/how_to_change_view_google_mapsb0pt6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0879403c-3be5-48e4-925f-21334a7d5cfe.filesusr.com/ugd/407fcc_bb7742be5ebc4b4cb8b17c80539617b1.pdf?index=true
    • https://09d56968-2ae9-412d-ad86-e67dc63a1c23.filesusr.com/ugd/e8b91f_126011313ac944c48cecf867a617c49d.pdf?index=true
    • http://gexazavere.epizy.com/bushnell_1000_rangefinder_manual.pdf
    • https://4a1cfc67-5981-466d-a13b-75576fe7431f.filesusr.com/ugd/64e449_295a2feff98d4872a33fd0c4a703d57d.pdf?index=true
    • http://remofexemuja.rf.gd/mavojukixetega.pdf
    • https://1801fa0f-56e4-4894-8452-b8e06651d4be.filesusr.com/ugd/868401_8eb6bd6e9e094c239b45dce1b7446a16.pdf?index=true
    • http://mafefelanepule.epizy.com/xoxijaxis.pdf
    • https://s3.amazonaws.com/geraromu/tales_from_the_loop_episode_1_cast.pdf
    • https://s3.amazonaws.com/zabejuvijolu/jipumawudigozawiwaperuza.pdf
    • https://bf68d742-fb98-404a-ab47-1dcf24f7df52.filesusr.com/ugd/83e7fd_f8a1dac2fa2a45689021e4c06c34456f.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_off0000fbe8.bin
576003e4171d4471f49ad5b9a50782e5ce063ac11558252d446169dd74ae7675		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE8 5260 bytes
font_01_sfnt_off00010daf.bin
0d8c213e281854a9b4acf2b5e7ee9349ce79210dc540169a7bcb22d8802c5620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAF 12116 bytes

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