Malicious PDF — malware analysis report

Static analysis result for SHA-256 874823cfa6f9b9cc…

MALICIOUS

PDF

77.3 KB Created: 2021-01-17 11:04:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: c959b75df0e03e87a207b0b1e72888ab SHA-1: e7972b7c6d4f0f3687b2e9722144dac042d6017b SHA-256: 874823cfa6f9b9cc14d87476afaf451b664bc57235b9a6c26ff330ca79a6a458
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and contains multiple embedded URLs. One of these URLs, 'https://traffset.ru/aws?utm_term=online+teacher+interview+questions+and+answers+pdf', is presented in the document body, suggesting a phishing or scam attempt. No scripts were extracted, but the presence of external URIs and the overall detection suggest the PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffset.ru/aws?utm_term=online+teacher+interview+questions+and+answers+pdf PDF link annotation
    • https://cdn.sqhk.co/pevelefotuve/ehe8gdI/vabida.pdfIn PDF document text
    • https://site-1175953.mozfiles.com/files/1175953/sirezif.pdfIn PDF document text
    • https://cdn.sqhk.co/makubeku/btifhje/kojiwopimapufiwerufexef.pdfIn PDF document text
    • https://cdn.sqhk.co/tititafoza/highihd/96100784448.pdfIn PDF document text
    • https://cdn.sqhk.co/fekigimuzib/d2QNpwd/vamelop.pdfIn PDF document text
    • https://cdn.sqhk.co/miwiwefe/iwZhejf/rozuzezake.pdfIn PDF document text
    • https://cdn.sqhk.co/saboxiwago/ohbhghg/tisijokiroluralebufudo.pdfIn PDF document text
    • https://cdn.sqhk.co/muruwake/ZXAgggd/56774599936.pdfIn PDF document text
    • https://cdn.sqhk.co/foroboreb/hef0jgy/zekovumukalegepema.pdfIn PDF document text
    • https://cdn.sqhk.co/pufowuvikij/L1gftgg/11767039362.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/gupojakami/promissory_note_template_payment.pdfIn PDF document text
    • http://sakigekoxigukil.epizy.com/meningite_et_meningo_encephalite.pdfIn PDF document text
    • http://fuxufotab.epizy.com/resume_for_teacher_job_application_format.pdfIn PDF document text
    • https://s3.amazonaws.com/degagaziv/57602076884.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/kensington_park_elementary_uniforms.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/gagukepepudu.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/miya_bhai_song_dj_remix_mp4.pdfIn PDF document text
    • http://dofomexikokubeb.epizy.com/case_study_format_for_nursing_students.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/44213433487.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_off0000f16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16D 5548 bytes
SHA-256: 02e5643239611970b8c9d6a0ecf18126fd12e6eeeb63410d2f7e42a310e1ad6e
font_01_sfnt_off00010454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10454 10472 bytes
SHA-256: f1338159709ac9929e884c7534da59cc445fc39c519fdba9fca7f863918a8671

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