Malicious PDF — malware analysis report

Static analysis result for SHA-256 be9f2ab5fd099b69…

MALICIOUS

PDF

72.9 KB Created: 2021-02-22 14:12:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e51c74e6a57738b6f884d632ed2daed5 SHA-1: 971f8c5af504b65c518ee7a20081918557c0bd4c SHA-256: be9f2ab5fd099b69118540499d54ce1417bc5096ab28364e90095d516b715414
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.001 Malicious Link

The PDF contains a fake CAPTCHA lure to trick users into interacting with malicious links. It links to known malicious redirector infrastructure, specifically 'https://yafferge.ru/wb?keyword=how%20to%20get%20free%20fortnite%20codes%20ps4', which is designed to lead users to further malicious content. The document also functions as a link farm on disposable hosting, indicating a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.
  • 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://yafferge.ru/wb?keyword=how%20to%20get%20free%20fortnite%20codes%20ps4 In PDF document text
    • http://optamorem.com/matofenutesogokagoliphlun2.pdfIn PDF document text
    • http://popularchoice.space/antonyms_worksheets_2nd_gradeou48l.pdfIn PDF document text
    • https://cdn.sqhk.co/wogefosa/pphcid8/nixogoletadijiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449990/normal_60142271640df.pdfIn PDF document text
    • http://ital-tess.space/assistments_answer_keybu537.pdfIn PDF document text
    • http://bbcua.site/sniper_3d_gun_hack_version_download2245b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394062/normal_5fdf312ceda09.pdfIn PDF document text
    • http://doctora.club/50101962110sv3ma.pdfIn PDF document text
    • https://cdn.sqhk.co/kapipota/hewifje/folebof.pdfIn PDF document text
    • http://milano-moda.space/8162316610qjo76.pdfIn PDF document text
    • http://rinuzaje.iblogger.org/not_enough_memory_available_to_read_worksheet.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
    • http://powosegunivu.epizy.com/ijoms_author_guidelines.pdfIn PDF document text
    • http://rozazidugo.epizy.com/fuwadu.pdfIn PDF document text
    • http://wipidomi.rf.gd/website_domain_and_hosting_information.pdfIn PDF document text
    • http://wuvelar.epizy.com/jesus_storybook_bible_coloring_book.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8C 5008 bytes
SHA-256: 12ff0b501c9c2970110d75d10e32491cda0e8d750d354126d4213deaba94097d
font_01_sfnt_off0000dbbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBD 2092 bytes
SHA-256: 9fcfd2b2c12c9d480c0beec3ee39f05b9e518edc5177a7a5fcc68dff0371f8a2
font_02_sfnt_off0000e55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55E 10328 bytes
SHA-256: 0e59d893f027c3c5fb32b56a3d79430cfcb9645c5c67edbbd1a6e0879205b7e3
font_03_sfnt_off00010824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10824 4324 bytes
SHA-256: 8405bb6ca9a6fb718a2e910e1cdde4d74ac2122cab0061dc5f772322db9c7ccd