Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a7d16aa7f6ebd0…

MALICIOUS

PDF

77.7 KB Created: 2021-01-25 08:31:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c62fa4facf40c432acdba2683e285637 SHA-1: e6be62b5cefb0dfbebd541438d2ba8676f2650f6 SHA-256: 23a7d16aa7f6ebd098a37dd7f0bb29a7f5dc5ef9f58b3edb00c930e73bac0095
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a heuristic firing for a link farm pointing to external PDFs, with one URL being https://trafffe.ru/123. The ML classifier and ClamAV detection strongly indicate maliciousness. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/123?utm_term=food+and+beverage+controller+salary PDF link annotation
    • https://nujelojebalu.weebly.com/uploads/1/3/4/6/134690198/poxujaneziganomove.pdfIn PDF document text
    • https://batuputuj.weebly.com/uploads/1/3/0/7/130739628/zamufajaxosag_tusaxosis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424632/normal_5ff524b0c929c.pdfIn PDF document text
    • https://livugazenexaru.weebly.com/uploads/1/3/1/6/131607095/6019282.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vatosolikijike/roxepexa.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/identifying_parts_of_speech_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/14792032293.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/calling_all_mixels_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/piano_sheet_music_someone_like_you_adele.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/airline_industry_overview_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/lopokid.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/cea_annual_report_2017-_18.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/lockheed_martin_gps_iii_fact_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/definition_of_chloroform.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE769 5104 bytes
SHA-256: 5b21a776df950620aeebef4ae2c20980302cef40f392dafbc52ad12d8966743c
font_01_sfnt_off0000f8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E7 10172 bytes
SHA-256: 712f065f716bbc5f155737b464b9337bf0dace8673b5be1c2cea82a65dcbe865
font_02_sfnt_off00011bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB2 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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