Malicious PDF — malware analysis report

Static analysis result for SHA-256 f15fdc70b6bb6e99…

MALICIOUS

PDF

83.6 KB Created: 2021-04-03 06:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e932a26fc5ce0142a72381275b0182a9 SHA-1: 585f601098f11ab3ed08ff19640834bc9da098f7 SHA-256: f15fdc70b6bb6e999eebac0d4d936bd2d2281fbb425c48c2832536a8064ad742
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a specific detection name indicating it's a phishing trojan. It contains an embedded URL pointing to a suspicious domain, disguised within content that appears to be a physics worksheet. The PDF structure and embedded URI heuristic further support the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://pelibifir.ru/wix?keyword=free+fall+worksheet+physics PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4482418/normal_60320ed7b721b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482399/normal_5fcc216e90be0.pdfIn PDF document text
    • http://wowit.pro/xumaxatudozoterapew9frav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416796/normal_6066a57318638.pdfIn PDF document text
    • http://rasezatoxefu.mygamesonline.org/circadian_rhythm_disorder.pdfIn PDF document text
    • http://vamoktin.ru/positive_and_negative_punishment_psychology_examples0dwn6.pdfIn PDF document text
    • http://tesar-krd.ru/332516243964f6x7.pdfIn PDF document text
    • http://fidesuwuranotif.getenjoyment.net/cms_covering_all_bases.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493245/normal_602f8adda7d22.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d250a78-fc8a-4962-ba58-3e0c19271745/81889084483.pdfIn PDF document text
    • https://s3.amazonaws.com/borokegujuzero/feliz_navidad_jose_feliciano_release_date.pdfIn PDF document text
    • http://tiredosutozol.atwebpages.com/capitalism_in_america_greenspan.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/46593219498.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/27572698697.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa28847d-c2d7-4c55-b14f-dc68bd6bccc7/37482477456.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/cgap_was_formed_in_which_year.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/vusifonabubewekinadag.pdfIn PDF document text
    • http://jumepenitujox.atwebpages.com/81797345162.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/jason_capital_age.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fff744f-28b3-48f2-8785-0b3b37d524fc/is_a_2.9_gpa_bad_in_high_school.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/90638834750.pdfIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/loduxojinozavepor.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB2 5316 bytes
SHA-256: 3e3c94e8dcb42858a9b8220cb395dbed02169c3b4b5f877bd88c71cf76351d86
font_01_sfnt_off000101e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E1 11940 bytes
SHA-256: 1197e2a6f04e2376c83de1b317129bcc3ba169b4790276b2db425c847d3e6345
font_02_sfnt_off00012a71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A71 16508 bytes
SHA-256: 786704e6ae86dde6cc8b9ef23e6376cb6e1f7371ab226cd698ff886b2385aa7d

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