Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6e8d78d9d572264…

MALICIOUS

PDF

71.9 KB Created: 2021-02-25 15:10:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 99b5d1385b1314078aafbcae94a5b564 SHA-1: 1a8137005dbd838b61294042112b956b645e2afc SHA-256: a6e8d78d9d5722641af3f8d22e6d6696549115dc089cbfe43491847321749ad4
244 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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.
  • 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://crophysi.ru/award?keyword=nancy+madore+enchanted+%25E2%2580%258B%25E2%2580%2593+megig%25C3%25A9zve+pdf In PDF document text
    • http://bikejesoxatelo.mygamesonline.org/chocolate_black_and_tan_cream_red_miniature_dachshund_puppy_for_sale_nyc.pdfIn PDF document text
    • http://buloshnaya.site/dekesibawmq4n.pdfIn PDF document text
    • http://tosefabebiribow.scienceontheweb.net/how_to_fix_operating_system_not_found_try_disconnecting_any_drives.pdfIn PDF document text
    • https://cdn.sqhk.co/takoxuwal/fpcigyw/40163914819.pdfIn PDF document text
    • https://cdn.sqhk.co/gusiloxi/FQorifw/pumujatimepowaxenodox.pdfIn PDF document text
    • https://cdn.sqhk.co/birenejar/VovMpYW/gakuvav.pdfIn PDF document text
    • https://cdn.sqhk.co/talurelope/jaRsjHg/ravens_schedule_2020_opponents.pdfIn PDF document text
    • http://springwin.space/nanda_nursing_diagnosis_2018_freguxg7.pdfIn PDF document text
    • http://jiwapadenejeza.getenjoyment.net/belabaj.pdfIn PDF document text
    • http://wifunagidoli.mypressonline.com/norcold_refrigerator_not_working_on_electric.pdfIn PDF document text
    • https://cdn.sqhk.co/lituxopevuk/bgdx7ge/wovovibewag.pdfIn PDF document text
    • https://fikadodovawewa.weebly.com/uploads/1/3/4/3/134320255/refabezigip-tetixadapo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tiwatimab.atwebpages.com/61859218700.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_off0000da04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA04 5720 bytes
SHA-256: 9fca687a38c8239c11abceda1cfc1893acd0b235085558c00d452db427f527f2
font_01_sfnt_off0000ed45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED45 10288 bytes
SHA-256: 6259b74eae15503ef7159749606ef1061582a29199070cd92579e4a3a416f10d