Malicious PDF — malware analysis report

Static analysis result for SHA-256 c31723af482e9ebc…

MALICIOUS

PDF

52.6 KB Created: 2020-11-08 03:09:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-15
MD5: df4fdd415aa337b30a8740caee990caf SHA-1: 41e498e74ead054fcd7832f5e62360a8bcaff338 SHA-256: c31723af482e9ebc12b275047127367f73eed156d1a1527e95dfa7aebafcc6f8
76 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffset.ru/123?keyword=second+life+mobile+app+for+android PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387810/normal_5f9323786de20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388285/normal_5fa3013d9aef6.pdfIn PDF document text
    • https://buximinolid.weebly.com/uploads/1/3/1/3/131381316/5d1355094df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446388/normal_5fa73cbf3cddf.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/winepogor.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
    • https://uploads.strikinglycdn.com/files/504ade39-a76f-4d44-a937-3da8b05b89d2/52352217074.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d000682-47ca-4b80-a017-0261e3bdb934/rupot.pdfIn PDF document text
    • https://kuwibanaxar.files.wordpress.com/2020/11/32802357695.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0851f696-fe0e-49cc-be50-11604dc4bd64/barrons_gre.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/11444021283.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_off000080cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80CB 5076 bytes
SHA-256: 5bcd82dd6b022e883fa048a1889f59d2a023ac2eca1907b4e81ab6532aaa371d
font_01_sfnt_off000091d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91D1 11100 bytes
SHA-256: 34a40e8456fc86d2bc94e339a4b7792eddda77b541b718fb188b9173ed1ad72b
font_02_sfnt_off0000b794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB794 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c