Malicious PDF — malware analysis report

Static analysis result for SHA-256 42b6106762085818…

MALICIOUS

PDF

66.8 KB Created: 2021-02-17 15:51:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: effcef287c76323279710cc21e8f2e3b SHA-1: 9b6800c0c3225438ec74e26eeb6eca39b612340c SHA-256: 42b61067620858189ac436f69060623b92b9d1bbdaa358dd9d2b97a4654d2db1
184 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://yafferge.ru/wb?keyword=conversations%20in%20american%20literature%20chapter%202 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369306/normal_600fe50ec4ba0.pdfIn PDF document text
    • https://jowopuvuramikir.weebly.com/uploads/1/3/5/3/135313070/limigezu.pdfIn PDF document text
    • https://nijegowililuxis.weebly.com/uploads/1/3/0/7/130739340/9f2061a2.pdfIn PDF document text
    • http://abzac.me/64781239349hdjkv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374009/normal_5fd8af63e9de9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387054/normal_5ff25e5ea4123.pdfIn PDF document text
    • https://kobamewimituk.weebly.com/uploads/1/3/1/6/131606733/6d0965df8b1ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413110/normal_5fec0056552cd.pdfIn PDF document text
    • https://tetemubegogik.weebly.com/uploads/1/3/4/4/134443084/vuwadutal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485173/normal_5fdaaae4a5a4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471085/normal_600f44082e4e6.pdfIn PDF document text
    • https://xinelonaveguv.weebly.com/uploads/1/3/4/6/134606197/c47f5b50cfd6146.pdfIn PDF document text
    • http://stingeksoj.online/annotate_in_linuxfwly2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405206/normal_5ff2295224a27.pdfIn PDF document text
    • http://twenty-promo2020.ru/344285334826w4o1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87D 5268 bytes
SHA-256: e5048b4caa164f163d0b2c49bf81dbba15650b439640d23acd0e40d6ab8bc611
font_01_sfnt_off0000da3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3D 10600 bytes
SHA-256: 664bc945b5e862271d97795d935205b9edbd9504bfe609b2b35a58092206b599