Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5b57d49af00d166…

MALICIOUS

PDF

82.7 KB Created: 2021-03-30 15:29:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 47b8675339fd4034c20f6abd943b1e54 SHA-1: d3b92d77a9b74d064eec4a74164ed937ca4e1728 SHA-256: b5b57d49af00d166312c4b4d070cef4a4293b49f090b24be27b547e2069e18ee
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 as Pdf.Phishing.Trojan. The ML classifier also flagged this PDF with high confidence. While no scripts were explicitly extracted, the presence of external URLs and the nature of the detection suggest a phishing or credential harvesting attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://leonvi.ru/award?keyword=renal+dialysis+procedure+pdf PDF link annotation
    • http://fastcreditcheck.info/estrategias_de_lectura_para_nios_de_primero_de_primarian2frr.pdfIn PDF document text
    • http://tiktokfrance.fun/thermaltake_core_v1_snow_edition_mini_itx_chassisju53g.pdfIn PDF document text
    • http://posurazatux.mypressonline.com/45164530220.pdfIn PDF document text
    • http://jirenaxapibetig.scienceontheweb.net/barangay_protection_order_form.pdfIn PDF document text
    • http://toworugesolur.getenjoyment.net/how_to_use_master_test_kit.pdfIn PDF document text
    • http://nekretnine.site/birthday_cake_images_for_boyfriend1q2o2.pdfIn PDF document text
    • http://megidexabaror.mywebcommunity.org/que_es_codominancia_genetica.pdfIn PDF document text
    • http://zodatowafe.getenjoyment.net/vifekekewezifapamuvanu.pdfIn PDF document text
    • http://sigisuzuk.getenjoyment.net/40662879381.pdfIn PDF document text
    • http://all-casino.xyz/its_mightier_than_the_sword_as_per_a_proverb_crosswordgjb7j.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3228dc58-b2c1-4aed-ac20-03fc52793822.filesusr.com/ugd/43afbb_6b0ea010ba4f4f299dca955d1b0a50ad.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/futamo/temubupitodum.pdfIn PDF document text
    • https://203aa715-7352-46b1-b16b-5d0aeeaa27a2.filesusr.com/ugd/0582e0_0cadb74a16484fefbabfe8c1735952ee.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tadevewuju/5660597846.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/captain_america_hd_wallpapers.pdfIn PDF document text
    • https://2987c0f4-171e-4473-b3f1-a5468658115b.filesusr.com/ugd/75ff8a_0717233c89bc42d6a182290158968960.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/3152596091.pdfIn PDF document text
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_d4f21dd928ce4035ba42feec1c073b94.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/54544476254.pdfIn PDF document text
    • https://636e06b3-920c-4898-b827-ef778bbbc101.filesusr.com/ugd/40512e_51b2043534ea405c9be330b909266698.pdf?index=trueIn PDF document text
    • http://pijosufun.myartsonline.com/14500969125.pdfIn PDF document text
    • http://zizenatoxu.myartsonline.com/58941283231.pdfIn PDF document text
    • https://36c7cc68-87de-491a-bce4-b7d773d69ff8.filesusr.com/ugd/3254bf_8fe7dacb34f34b59b93faefdf57fe16f.pdf?index=trueIn 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_off0001080e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080E 5256 bytes
SHA-256: a99c99886df477d709776bbf8093f78a29006d7415634667746a69150625cadd
font_01_sfnt_off00011a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A11 10428 bytes
SHA-256: 2f5659cf9ac4a3fffca1fac457ea5b6f543c9f0b0b624e734cc94ef063e2c230

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