Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc1880a0885b25b5…

MALICIOUS

PDF

79.0 KB Created: 2021-03-27 17:07:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1770ba52a4fe2bc96464d47f43eef2b1 SHA-1: 2bcc41c9538e97a499bacfc6260b9f70e09b59da SHA-256: dc1880a0885b25b5d276a37ce561cbfa1741eedf9fa8759d1ad88aa735040e76
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating the presence of external URIs. The document body, though heavily obfuscated, suggests a lure related to 'pituitary hormones pdf'. The primary malicious indicator is the embedded URL pointing to 'vilenefex.ru', which is likely used for phishing or malware distribution. No scripts were extracted, but the PDF structure itself contains malicious indicators.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://vilenefex.ru/award?keyword=pituitary+hormones+pdf PDF link annotation
    • http://jeratojovu.66ghz.com/88754009487.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455396/normal_5ff07c2acec10.pdfIn PDF document text
    • http://damvglaz2.xyz/how_to_replace_asko_dishwasher_drain_hosejsx24.pdfIn PDF document text
    • http://dontbeshy.xyz/bezeludtv9.pdfIn PDF document text
    • http://natbeach.space/android_box_apps_not_respondingqol2m.pdfIn PDF document text
    • http://gexedufez.22web.org/act_test_dates_2021-22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418791/normal_603e1812a4075.pdfIn PDF document text
    • http://rentline.pro/north_african_originnrzhl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528876/normal_6033ef5fd3a6a.pdfIn PDF document text
    • http://eferevole.com/standard_catalog_of_world_coins_1801_a_1900spalb.pdfIn PDF document text
    • http://fusojosejivo.iblogger.org/lozebigeputupapupu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367624/normal_6003618e442b5.pdfIn PDF document text
    • http://ecosbor.net/rifab3wwbq.pdfIn PDF document text
    • http://sodahq.pro/letter_of_authorisation_format_for_gstkjb8p.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/beastly_alex_flinn_espaol.pdfIn PDF document text
    • http://pirarotuweze.rf.gd/30731302959.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/rear_horned_baboon_tarantula_care_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/boy_scout_bear_book.pdfIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/99116311998.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/burnout_revenge_pc_games.pdfIn PDF document text
    • http://rasukilore.epizy.com/ncert_books_class_11_chemistry_download.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF318 5352 bytes
SHA-256: 1baf62459934133c020cae82b61eaf68149f318487cf98dcd89252afd58291c6
font_01_sfnt_off0001052c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052C 12180 bytes
SHA-256: 147b299c8b312f9f660d04f51f960778741c3335108f4d71f7f64ccc92cf7a6e

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