Malicious PDF — malware analysis report

Static analysis result for SHA-256 8efa9b4fe357531e…

MALICIOUS

PDF

70.6 KB Created: 2021-02-13 03:11:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 467891ca971f7c1291a20ac96c791f3b SHA-1: bf96e6a4464314d7c9292ae9e6da2b7cfbd545ab SHA-256: 8efa9b4fe357531e641ea634876bc534e91d36e38c2e189b018593de1ad16078
194 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/wix?keyword=csi+bridge+reference+manual In PDF document text
    • http://wei-nmvc.com/kagigiwaw0ypb.pdfIn PDF document text
    • http://topmassage.net/iec_60617_electrical_symbolsojy19.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415334/normal_5ff8cd8b4c786.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456399/normal_5ffabdd9e39eb.pdfIn PDF document text
    • http://pe50off.pro/texanagexitm2dm.pdfIn PDF document text
    • http://ukranews.icu/kefixidinijapcc73r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389074/normal_602400eb262c4.pdfIn PDF document text
    • http://submonster.xyz/dutavapudujapideyx4md.pdfIn PDF document text
    • http://hushseo.online/81772533144nz8y0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425235/normal_600fd84624d99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455380/normal_601a4bc05e931.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459641/normal_5fc82e46a0f7d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387706/normal_6000c48c48e35.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/74258235939.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/fhps_course_description_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBB 2004 bytes
SHA-256: 080b9344b6fc714ad4200ab3f5301270f65c0a7f13656fd1af9ed9b13a120ec9
font_01_sfnt_off0000d623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD623 5384 bytes
SHA-256: de3dfc204c34d45d04b8775d63a173cc964fe8247e2aac49e71472449f378a6b
font_02_sfnt_off0000e855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE855 10812 bytes
SHA-256: 8e97bff3dac244d4866cc867c38a4c6b7886aecff1a66364d831e11387ecdead