Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5d0bf6ef0877a77…

MALICIOUS

PDF

95.6 KB Created: 2021-04-07 08:23:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2183b4266272b5f65ba78dc11e53a613 SHA-1: 8e00636a4af2a432d79b5ba68eb60a0971b9e443 SHA-256: b5d0bf6ef0877a77bf59292f2415048f1cf38304af095af2bd914dc53bed04d1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9996

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 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
  • 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://bologen.ru/strik?utm_term=best+universities+for+ethical+hacking PDF link annotation
    • http://tugokutuli.scienceontheweb.net/langston_hughes_birthday_poem.pdfIn PDF document text
    • http://importants.space/lepolenakebaxolikeradu2d.pdfIn PDF document text
    • http://devgm.design/usps_mail_anywheree8qra.pdfIn PDF document text
    • http://difanitukovu.mywebcommunity.org/lidizofabamedova.pdfIn PDF document text
    • https://nojinogexosop.weebly.com/uploads/1/3/4/6/134695112/buzufimudowusefog.pdfIn PDF document text
    • http://lg-supportteam.com/dean_koontz_books2pxu3.pdfIn PDF document text
    • http://onesmall.space/fuwipoboresoxoridafn26.pdfIn PDF document text
    • http://huseyincanx.com/2nd_grade_math_test_sheetsigdx3.pdfIn PDF document text
    • https://kenemujawov.weebly.com/uploads/1/3/4/6/134645985/093b3f6c8a588a.pdfIn PDF document text
    • http://salogogudezofa.iblogger.org/22487554553.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kugofabafomozo.epizy.com/virazile.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/asheville_nc_brewery_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/babem.pdfIn PDF document text
    • http://rusuxagek.rf.gd/69869853223.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eaf2716a-d639-4e69-856c-5a34c2800290/traductor_latin_espaol_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/904e98b4-4b24-480b-84ba-ebb852b78fca/how_to_reset_lexmark_printer.pdfIn PDF document text
    • http://jisijuvod.myartsonline.com/dapejikotel.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/kafitazamisotepif.pdfIn PDF document text
    • http://gipipirerogarul.rf.gd/wto_analytical_index.pdfIn PDF document text
    • https://s3.amazonaws.com/godewumazek/17054085286.pdfIn PDF document text
    • http://dowupozor.epizy.com/yale_mba_employment_report.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off000126e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E4 6744 bytes
SHA-256: 048fb1891f432488516cd811e7b04d68e7d39e548ca3495625137f8fb0c23ff4
font_01_sfnt_off000137c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C9 5316 bytes
SHA-256: d481ea826f362308406c35e04f2fb8495dc374ae3851ff72ef28777efd6037f5
font_02_sfnt_off000149ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149EA 11396 bytes
SHA-256: e21d5d2074d352ef68a0b064fa8e587c44b73bcb520949cc6fbc1ade5f263ad1

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