Malicious PDF — malware analysis report

Static analysis result for SHA-256 747e43b7f7eecf6d…

MALICIOUS

PDF

81.0 KB Created: 2021-03-04 05:40:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: e8618550d082656443ed2ac46e26b305 SHA-1: bd14e09bdbadb8315f49f384f332d7184a05496b SHA-256: 747e43b7f7eecf6d55fb36847ea6e065b8769854108b6c13b4e643d1a3979942
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary URLs, 'https://nipisod.ru/strik?utm_term=how+to+use+trapezoidal+rule+to+find+area', suggests a lure to a site that may be involved in SEO manipulation or phishing. The ClamAV detection and ML classifier further indicate malicious intent, likely related to phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://nipisod.ru/strik?utm_term=how+to+use+trapezoidal+rule+to+find+area PDF link annotation
    • http://kesuvajeb.scienceontheweb.net/bagejokemurovogufe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373016/normal_6016de73149fa.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/iazgHj1/metur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475559/normal_5fe1ae2be81fb.pdfIn PDF document text
    • https://lofokuvowuvi.weebly.com/uploads/1/3/4/3/134362742/fajodalikuj.pdfIn PDF document text
    • https://lekifusa.weebly.com/uploads/1/3/1/3/131382118/6646770.pdfIn PDF document text
    • https://dawijenumekoxel.weebly.com/uploads/1/3/6/0/136087820/rozamozidur.pdfIn PDF document text
    • https://lomewulepizava.weebly.com/uploads/1/3/3/9/133999744/xafane.pdfIn PDF document text
    • http://wogivodugakovek.mygamesonline.org/why_is_my_motorola_not_ringing.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/rurosaveruk/american_football_team_logo_vector_free.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/zero_and_negative_exponents_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/berger_load_data_6.5_prc.pdfIn PDF document text
    • http://nafaradevofipaf.myartsonline.com/catcher_in_the_rye_chapter_1_quizlet.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/death_note_movie_lights_dad.pdfIn PDF document text
    • https://s3.amazonaws.com/gazijewevan/oakland_athletics_font_free.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_off0000fba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA2 5136 bytes
SHA-256: 655f1c8fd96d89c920a8f8247eda0a4254ba3c2e658a75627ea23be340d30e64
font_01_sfnt_off00010d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D43 12524 bytes
SHA-256: c29f86ed8e3f76f461f7dbdaf8734bfabf175d5b61a845f274bcbb7bfca09a32

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