Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0bf763fdc4d52c5…

MALICIOUS

PDF

67.1 KB Created: 2021-04-23 13:40:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 359e524a82b58b68496868c4f0ec3cef SHA-1: d9a342ddf9e6961cf7dc60542a5b3fffb81e148d SHA-256: b0bf763fdc4d52c5f52249fa33e39f388dabf24b1f4d965575120b9f6bd456de
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 high risk score. It contains an embedded URI pointing to a suspicious domain, 'midufefew.ru', which is likely used for phishing or to host a secondary payload. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, but the primary malicious indicator is the external URI.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/strik?utm_term=can+i+wrap+my+own+car PDF link annotation
    • http://lightstart.xyz/tikazczefc.pdfIn PDF document text
    • http://piwifeg.22web.org/edgar_allan_poe_download_portugues.pdfIn PDF document text
    • https://cdn.sqhk.co/rejoxapuzopa/giib5gf/fudilidakaruxufazelut.pdfIn PDF document text
    • http://letekidela.iblogger.org/sebibibugo.pdfIn PDF document text
    • https://cdn.sqhk.co/vozeseseber/jhw0thd/zombs_io_hack_no_download.pdfIn PDF document text
    • http://creditscoreusa.info/fomugekinirigula4mmiy.pdfIn PDF document text
    • http://cccckkkkkdd.space/kosiboyr984.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/jinabom/rational_world_paradigm.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/muzerok.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/hermann_hesse_steppenwolf_deutsch.pdfIn PDF document text
    • http://pipumatatipubu.rf.gd/juwisowinom.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/tamil_guide_for_class_11.pdfIn PDF document text
    • http://momugegunimex.rf.gd/din_en_iso_13485.pdfIn PDF document text
    • http://bofapivumike.rf.gd/perbedaan_angina_pektoris_stabil_dan_tidak_stabil.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/milady_chapter_13_review_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/laser_cut_wine_box_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/assamese_bihu_image.pdfIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/53330986527.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/22907450249.pdfIn PDF document text
    • http://kotidaw.epizy.com/vcf_file_android_read.pdfIn PDF document text
    • http://wuresuju.epizy.com/are_college_deadlines_the_day_of_or_before.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_off0000cae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE4 4968 bytes
SHA-256: cef15afaa5bdbb1f5ddcc0b1eab966be201915bc51644b0330e04a8dec2e7969
font_01_sfnt_off0000dbcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCF 10500 bytes
SHA-256: 2f8e5cc7dd018fb6bc88975c740e199dbdda5b484ddf47994416077eae7da21a

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