Malicious PDF — malware analysis report

Static analysis result for SHA-256 6158a4f9899bc548…

MALICIOUS

PDF

86.8 KB Created: 2021-04-08 21:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b548a9972d4bfa873effd6ca1bfb5312 SHA-1: 9cbbe64a6ca3f9aa13d6b4c598f7b037d5876b09 SHA-256: 6158a4f9899bc548fe3d496929359d43f24d44e2de41057b769b5b984bf9bc3d
116 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. The heuristic 'SE_CALLBACK_LURE' indicates the document's content is designed to trick users into calling a phone number, a common tactic in callback phishing and tech support scams. While no scripts were extracted, the PDF itself contains an embedded URI pointing to a suspicious domain, likely part of the phishing infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://jumiwimov.ru/strik?utm_term=skyworth+tv+55+inch+price PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4451945/normal_6001da921fdd8.pdfIn PDF document text
    • http://polikarmonolit.ru/sotojutajaljxb9u.pdfIn PDF document text
    • http://idealsit.fun/865940025898aszb.pdfIn PDF document text
    • http://richteam.site/airbnb_pitch_deckwb1hv.pdfIn PDF document text
    • http://sowopezamiw.medianewsonline.com/peter_pan_book_series.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366309/normal_60007a88eb704.pdfIn PDF document text
    • http://lnstagramverificationbadge.com/noxituwanuxikuvogya39.pdfIn PDF document text
    • http://zegobudipaju.mywebcommunity.org/arqumedes_de_siracusa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391920/normal_605f6d0f178c9.pdfIn PDF document text
    • http://novubelugalij.medianewsonline.com/frm_credit_risk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387219/normal_6031b9bd66015.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453908/normal_60121abb68637.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/legenapi/suspension_training_upper_body.pdfIn PDF document text
    • http://befokube.rf.gd/43181853129.pdfIn PDF document text
    • http://vumamuv.myartsonline.com/alloying_elements_in_steel.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/nixejurube.pdfIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/tripartite_agreement_format_for_import.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/contrato_de_arrendamiento_de_vivienda_simple_word.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/52214189718.pdfIn PDF document text
    • http://jedenibiripo.epizy.com/57039789298.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezux/casual_employment_contract_template_wa.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/are_crib_screws_universal.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/fetijufekefulisomolikex.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF447 2912 bytes
SHA-256: c2962e6e66715ff056ecc62b01c750f8fe4c6670d0101875c38f559989427813
font_01_sfnt_off0000feae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAE 5144 bytes
SHA-256: 2a589eaa7fa86503e82b55cee6324d1b238037b5b66df011027f2ca93e2bb4cd
font_02_sfnt_off00011058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11058 11520 bytes
SHA-256: fd954aea670b7599b0e37d58053456b4ed127fa10f76a33217dbcac2b281e044
font_03_sfnt_off000137cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137CD 16140 bytes
SHA-256: 2732c78df68b4531e26da51a256f0f9ab881cb8a96d1886ade34872d88eeece3

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