Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1f459245ae2472c…

MALICIOUS

PDF

72.3 KB Created: 2021-03-30 20:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a7adb31d58874e4c1f87157259384b81 SHA-1: cfa63167e9fb27bdd3a3768322c351752cfc10f0 SHA-256: d1f459245ae2472cfac997250be33fe097d9c475aaf72bdadb8a1e18c1e3325d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://mezovuduw.ru/123?utm_term=estimating+decimals+worksheets+6th+grade PDF link annotation
    • http://denakap.22web.org/how_to_use_multilingualism_in_classroom.pdfIn PDF document text
    • http://workshop-fb.ru/bununewobawobafupikajo47v0.pdfIn PDF document text
    • https://bixikobitil.weebly.com/uploads/1/3/4/5/134525497/4042015.pdfIn PDF document text
    • https://ziwuvofoxovexo.weebly.com/uploads/1/3/1/1/131163777/zoleranerof-rusejaloguvori-xawokub.pdfIn PDF document text
    • https://kenibojowosude.weebly.com/uploads/1/3/5/3/135324683/rewukivone.pdfIn PDF document text
    • http://grizhoff.ru/In PDF document text
    • https://napuguvu.weebly.com/uploads/1/3/0/9/130969658/462897.pdfIn PDF document text
    • https://zunenevalomedo.weebly.com/uploads/1/3/4/8/134855990/8366923.pdfIn PDF document text
    • http://vinnipoh.fun/zula_e_pin_hilesi_2018kam3z.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d095e081-5f13-439d-851f-9e3c686bf36b/present_simple_and_present_continuous_exercises_esl_library.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/tamil_movie_2014.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/american_english_file_3_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d485a491-5333-4d95-ace7-1d90ad5954a0/zulogobunozuzu.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/panasonic_flatbed_inverter_microwave_oven_model_nn_sf550w.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/wopita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6aa56985-2c99-4eb6-adcc-9ba4c238225b/95778669227.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3db3dfa-e069-4e45-afe2-f1889332a7b9/67656286302.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/zirurezifeloriwo.pdfIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/muscle_workout_app.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/zafegunas.pdfIn PDF document text
    • http://felubefetixiwu.rf.gd/cea_2019_report.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/topoxufufumuvu.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/jinajobupukafalupo.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_off0000ddf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF4 5620 bytes
SHA-256: 47cc0d6a1917e40ae78fe23f2c760aadd57e2f7db0d7b5284b3c14ca37fb94a3
font_01_sfnt_off0000f0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F9 10356 bytes
SHA-256: 571c9c8b4bad250e75629f438d720df0e8590c51c741da8e7896c68259b073fa

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