Malicious PDF — malware analysis report

Static analysis result for SHA-256 0516e51393e4af79…

MALICIOUS

PDF

38.4 KB Created: 2020-11-09 07:55:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 61bbb82b8170c98719f7c89656caebce SHA-1: 745fe0ce37398e3ab5aa05c1acb8b45df82e0d09 SHA-256: 0516e51393e4af79af2ce1051239f9c4330a4a66fff39054de50b0b102e95c80
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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://trafffi.ru/aws?keyword=thomas+j+glover+pocket+reference+pdf PDF link annotation
    • https://lijipipixeralof.weebly.com/uploads/1/3/3/9/133999964/2686940.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390684/normal_5f9868847fb26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387712/normal_5f94d2c46d7d0.pdfIn PDF document text
    • https://subutadenurafo.weebly.com/uploads/1/3/4/5/134581349/8acba053b770edd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380226/normal_5f91c3f4c3033.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/8536469.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372377/normal_5fa50451219e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376382/normal_5f8dd6f5240b1.pdfIn PDF document text
    • https://laxefepi.weebly.com/uploads/1/3/4/5/134528647/456e72.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3985399-c641-4e3c-a47d-d75b7e79c2ab/mortal_kombat_11_wallpapers.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/ho_bieu_chanh_phim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2831554b-7853-44db-92b2-0b81f4a9d35a/wupenozuguwimelixub.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_off00005525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5525 5720 bytes
SHA-256: 329d6c7a31b2ab7e4c9c2001bfd2d4d0b2d3ded0073d266553137a1f5ee98b14
font_01_sfnt_off0000687b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x687B 10712 bytes
SHA-256: 5d3e3e5953779a9eb38c5db650f2a4d184a574ab4f2548d2016b3feb49802ef0