Malicious PDF — malware analysis report

Static analysis result for SHA-256 587a2bb38d0a39b8…

MALICIOUS

PDF

54.6 KB Created: 2020-11-07 08:13:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 600e6e4c1aa7355342f36465ddf2e0b4 SHA-1: a29c4a0a66550be0f95f689ee124c60e08680676 SHA-256: 587a2bb38d0a39b88c801f39870d5567d971e6eda6dd5898c64f906030d43ff3
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=unblocked+soccer+heads+world+cup+2019 PDF link annotation
    • https://sokonova.weebly.com/uploads/1/3/4/3/134322069/poxim_jemude_xubonukegejo_rarowavewatotu.pdfIn PDF document text
    • https://zosupexaduj.weebly.com/uploads/1/3/0/7/130738593/bfcd3bd8fff.pdfIn PDF document text
    • https://mukaxonalox.weebly.com/uploads/1/3/4/5/134580963/5d3a4.pdfIn PDF document text
    • https://fenawivo.weebly.com/uploads/1/3/4/0/134000055/jogaluzalo_sugajuwabadane.pdfIn PDF document text
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/bekuva.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://tanusiwik.files.wordpress.com/2020/11/dumipemejutikomiba.pdfIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/how_to_make_a_set_home_command_in_minecraft.pdfIn PDF document text
    • https://tojovaw651389336.files.wordpress.com/2020/11/fubipasikefop.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/ancient_egypt_an_illustrated_history.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d36d82f7-5057-47b8-a9ff-033d6f2bfa6a/91841536619.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/23057358938.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/maine_state_aquarium_boothbay_harbor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b513cea-8d82-4bae-8e56-c787310bf452/macbeth_study_guide_answers.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000a463.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA463 17908 bytes
SHA-256: 930bbdbd827be4de5b3190fcb4ecbd58a87b44e6d84a632fc77c34878130ecad
font_00_sfnt_off00006dc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DC2 5684 bytes
SHA-256: 64ddee679b16fba089cb42a391259f5276bbbd8355c0c44a1b3d0cca72f2e347
font_01_sfnt_off00008116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8116 10308 bytes
SHA-256: ad794ee5d6ac5be53206dfc75a5d8a92444e5a931161a786c8b9f199de5c5b11
font_03_sfnt_off0000bf4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF4E 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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