Malicious PDF — malware analysis report

Static analysis result for SHA-256 9db23fc22f717072…

MALICIOUS

PDF

71.7 KB Created: 2021-02-15 10:06:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 0fa745a517f6d05d85996a32e1b12150 SHA-1: 16e63c4304b8a4a7d6dbe2fab2184729a010a333 SHA-256: 9db23fc22f7170723adad4d8cb85d341ef185e254e778265767db4a73c31c83f
184 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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/wb?keyword=expression%20of%20asking%20for%20help%20formal In PDF document text
    • https://static.s123-cdn-static.com/uploads/4450426/normal_5fece858a1f15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425230/normal_60126a60b9575.pdfIn PDF document text
    • https://zitavuzan.weebly.com/uploads/1/3/1/3/131379524/naxuvixarirufopokix.pdfIn PDF document text
    • https://cdn.sqhk.co/pufuxarabo/gchhFS9/80310286854.pdfIn PDF document text
    • https://rimofunoduw.weebly.com/uploads/1/3/4/5/134525219/7308885.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451760/normal_60029e683be73.pdfIn PDF document text
    • https://pabidiwamudobav.weebly.com/uploads/1/3/5/2/135299897/dibigodulewadob.pdfIn PDF document text
    • https://cdn.sqhk.co/lutumodigi/jgn8ijC/talking_dog_buttons_for_sale.pdfIn PDF document text
    • http://stnold.com/oxford_english_for_cambridge_primary_550z03.pdfIn PDF document text
    • https://devudupaf.weebly.com/uploads/1/3/4/8/134880603/tatibikim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484376/normal_6021e7e3547b5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446152/normal_600646e762f70.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/ninazarila/arndanos_frescos_informacion_nutricional.pdfIn PDF document text
    • https://s3.amazonaws.com/gudukupir/6631636286.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/christmas_place_cards_template_word.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_off0000dc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC18 5404 bytes
SHA-256: 5eb5fb858cac52a5734bd758a24686c5ef9b1b342d8fb8e0aa1f07965aced04b
font_01_sfnt_off0000ee5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5B 10396 bytes
SHA-256: d6b14d4a3fa82ce78008579717b3cd6e7403f11757ed16e2d0fa24a0c360e724