Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a1970b7359749e4…

MALICIOUS

PDF

97.0 KB Created: 2021-05-22 16:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 47eb16a05c977770a4580ce858a22126 SHA-1: 529ac04ddb7011959865bb9ca72ee6f5b9b6b7e2 SHA-256: 5a1970b7359749e409128cb19ec489aa18e41ed4d482070f3dd5b69c725eca2b
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a PDF_SEO_LINK_FARM heuristic. The primary URL, https://jumiwimov.ru/strik, suggests a potential phishing or malicious redirection attempt. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jumiwimov.ru/strik?utm_term=how+much+does+air+resistance+affect+a+projectile
    • https://lupudeme.weebly.com/uploads/1/3/1/3/131378919/a009e51ab03aa.pdf
    • https://liwufodabex.weebly.com/uploads/1/3/4/8/134872973/987a5a12.pdf
    • https://static.s123-cdn-static.com/uploads/4427519/normal_5ff2b5b00218a.pdf
    • https://static.s123-cdn-static.com/uploads/4382790/normal_5feea7d359fff.pdf
    • https://static.s123-cdn-static.com/uploads/4408993/normal_5fef4c07e6f25.pdf
    • https://netajetuz.weebly.com/uploads/1/3/4/6/134651380/rurab.pdf
    • https://static.s123-cdn-static.com/uploads/4424027/normal_5ff8daeabfece.pdf
    • https://cdn-cms.f-static.net/uploads/4388421/normal_60611d0c21010.pdf
    • https://static.s123-cdn-static.com/uploads/4448345/normal_60048377d4741.pdf
    • https://cdn-cms.f-static.net/uploads/4371004/normal_60460feab84ff.pdf
    • https://static.s123-cdn-static.com/uploads/4491945/normal_5ff86f8467376.pdf
    • https://dokarugosili.weebly.com/uploads/1/3/4/3/134362608/gowakezagatu_gasawejuxerusuv_deginefulawo.pdf
    • https://cdn-cms.f-static.net/uploads/4375708/normal_5fdc5142e5aba.pdf
    • https://static.s123-cdn-static.com/uploads/4444095/normal_5ffcf65dcdd59.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rixevozajixezos/12891519965.pdf
    • https://s3.amazonaws.com/mokixetat/balancing_chemical_equations_worksheet_with_answer_key.pdf
    • https://s3.amazonaws.com/fefurorobumi/betewamilakifaf.pdf
    • https://s3.amazonaws.com/putelekireza/meiosis_quiz_with_answers.pdf
    • https://s3.amazonaws.com/nademopor/happy_birthday_sheet_music_violin.pdf
    • https://s3.amazonaws.com/posaxugidut/the_indigo_spell_espaol.pdf
    • 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_off00013b67.bin
c5c203b0d51af480192504fc77d37b12d3e741686da5dd1764c2eb9629362a97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B67 5524 bytes
font_01_sfnt_off00014e16.bin
75ee64faffd9ee1be5131d94f18031759d0bd669d1914c3013edd53a88d9d5f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14E16 11820 bytes

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