Malicious PDF — malware analysis report

Static analysis result for SHA-256 796c7b063488e1d3…

MALICIOUS

PDF

94.3 KB Created: 2021-03-15 06:16:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e7b28dce6c4e26657f8dae9734247ddd SHA-1: c7774a58ce07e32d99531e80b3b70fe47a686022 SHA-256: 796c7b063488e1d31cfd51ca2342ec0f46f2574d5bd693b613d3934ef05840f7
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 0.6676

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://dafemum.ru/award?keyword=old+macdonald+had+a+farm+lyrics+english+pdf PDF link annotation
    • http://kuroramogesok.iblogger.org/94881391430.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379486/normal_5fe7513a2780a.pdfIn PDF document text
    • http://ganitigusawev.mygamesonline.org/aspek_sumber_daya_manusia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529697/normal_5fe8c0dd8a956.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463809/normal_601624a8430e3.pdfIn PDF document text
    • http://xefawojuj.mygamesonline.org/evaluation_form.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485310/normal_60206e5c0ccf5.pdfIn PDF document text
    • http://mukinokelek.mygamesonline.org/knee_exercises_for_seniors.pdfIn PDF document text
    • http://malanefire.sportsontheweb.net/whirlpool_thin_twin_take_apart.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447097/normal_60291fc2b49af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459937/normal_6023ce845de1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501495/normal_5fe878ccbd0b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469863/normal_603b0a0c340ea.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/kozewuposoridil/tudonidaxaz.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/php_mysql_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/cuneiform_fracture_images.pdfIn PDF document text
    • https://0f0532cb-4478-41f9-91a1-cf277c4732ec.filesusr.com/ugd/8acad3_cb7dddaf70044462b533f70e64e7b308.pdf?index=trueIn PDF document text
    • http://jegubidetexo.epizy.com/acolyte_training_worksheets.pdfIn PDF document text
    • https://41c240d9-b4af-4f88-8fa4-2a41cce3a287.filesusr.com/ugd/01bc73_5ded8ea006e441499cc55dca06446550.pdf?index=trueIn PDF document text
    • https://fb79ad55-22b5-4823-9538-35c71bbbd514.filesusr.com/ugd/ea423f_4177a9c114cc4794830c64d9c1e4ca58.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wulagisi/75433655521.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/where_to_get_big_cardboard_sheets.pdfIn 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_off0001042d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042D 9876 bytes
SHA-256: 0652e23bcd16b0ae98aa6bfea5d84b5f81203be2eaf480f7f4eecb3e96cd68bc
font_01_sfnt_off00012590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12590 5700 bytes
SHA-256: 95327c18019727dbc5f440296db87d2f0d2882462af24e6d3e7f81f9901cb81e
font_02_sfnt_off000138d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D5 17880 bytes
SHA-256: 8b206bf75f07964685f21f3f3524d221516cedd8d18a12623172385ff9e5edf6

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