Malicious PDF — malware analysis report

Static analysis result for SHA-256 856914820ca64d0d…

MALICIOUS

PDF

49.1 KB Created: 2020-11-06 12:53:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-11
MD5: 10382837cd46757bcce96e0c61e8f517 SHA-1: 0f931e044ca44d937e756c4b40b574f8fd009b49 SHA-256: 856914820ca64d0df95275b6626d9f3eac74f620db965ab72f0095e9efe4a4f5
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://trafficel.ru/123?keyword=super+bowl+pool+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368230/normal_5fa01c31a4ad4.pdfIn PDF document text
    • https://zafozudakajadev.weebly.com/uploads/1/3/0/8/130814863/raxozu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368474/normal_5f881c476bb8b.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://s3.amazonaws.com/robumuduluwise/wurivagefagune.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc11e702-84df-45bf-8162-03628d186151/toledo_blade_obits_last_week.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/44881828575.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/72429688995.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbd2634f-c9b5-4ce8-9e06-27596d44d48a/30297673395.pdfIn PDF document text
    • https://s3.amazonaws.com/xopugup/mihile_maplestory_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5437fcd-0f75-4656-8812-0418bf486ac3/vipilo.pdfIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/35576654625.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a080432c-987c-4eb6-9d95-9603b607e11d/kovedepigewevamaxeve.pdfIn PDF document text
    • https://s3.amazonaws.com/jezobasit/ponirawopiwiwutawibezawe.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/runuwizubil.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_off00007333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7333 4680 bytes
SHA-256: 06f3c8d7dfadaa8f100529e658b405642e9941723aec9a27535f9e1f663aeb7b
font_01_sfnt_off00008336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8336 11360 bytes
SHA-256: 01bb5fa28d658f7d193f71a2d2903e4cd4494f919ae623c7794efd5a63540697
font_02_sfnt_off0000a907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA907 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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