Malicious PDF — malware analysis report

Static analysis result for SHA-256 081572a2a8ff14fe…

MALICIOUS

PDF

48.2 KB Created: 2020-11-08 00:55:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 855ebb3266161cde18f3fe7fa729b6ff SHA-1: f1fdf9488d6ce6a86e1c44331c83671f7d724020 SHA-256: 081572a2a8ff14fe360b32b4234fe8f1b350daf721bb9571f648ff4071f0e7a3
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://traffset.ru/aws?keyword=joker+2019+online+free+subtitulos PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408340/normal_5fa25b1825777.pdfIn PDF document text
    • https://xawalovu.weebly.com/uploads/1/3/4/6/134652108/3f628d040.pdfIn PDF document text
    • https://jinizunoluvazo.weebly.com/uploads/1/3/4/5/134592141/e7079972cd7bcf.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/lejexafopotak_nuwevirafikuv.pdfIn PDF document text
    • https://palozemoxapido.weebly.com/uploads/1/3/4/3/134366311/nudav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373768/normal_5f8b02da26951.pdfIn PDF document text
    • https://morurotefat.weebly.com/uploads/1/3/4/3/134317018/fenegisob_jawosolarelep_fabedujaworivog.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/6105a5a0-3c7c-46ef-8929-bd0d26711b20/nufifujukomipago.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc2abbb9-cc57-4a78-ae2b-bdf0c5516b21/53700226958.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/302d5b2c-8e2f-4f3b-8246-032daad0ff6e/marlin_buscando_a_nemo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4348fafc-df79-4e71-a858-b8b6a3e877ed/how_to_grow_wheat_in_minecraft_ps3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5585a06e-683b-43bf-aa96-443237b01f99/6659639109.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
    • https://bit.ly/36X5FPqIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off00006449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6449 6744 bytes
SHA-256: 048fb1891f432488516cd811e7b04d68e7d39e548ca3495625137f8fb0c23ff4
font_01_sfnt_off0000752e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x752E 5228 bytes
SHA-256: fb27adbd8005c7ba6f7aebf2274d517bf6ca3e26d0ac752d6724683588970e58
font_02_sfnt_off0000870c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x870C 14836 bytes
SHA-256: d7f720b7aa8740decb88ff33c4255bf9482c39a6bd288ba7a9d58ec482e0846a

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