Malicious PDF — malware analysis report

Static analysis result for SHA-256 18938dbd92fd6e8b…

MALICIOUS

PDF

34.6 KB Created: 2020-11-05 21:20:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: bc3a37b5f41f4cce3789dd52af37c142 SHA-1: 9e636520b6931a0eb5cb311a0c89831e8fb43b39 SHA-256: 18938dbd92fd6e8b0325880247d81786ed88370eddf4d73938187ffe41287e69
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged by an ML classifier as malicious and contains a large number of external links, indicating a potential link farm or SEO manipulation tactic. One of the embedded URLs, https://traffset.ru/123?keyword=kringle+express+gift+bags+set, is of particular interest as it is not marked as benign. The document's structure and embedded links suggest an attempt to drive traffic to malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=kringle+express+gift+bags+set PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408990/normal_5f96557010bf2.pdfIn PDF document text
    • https://mekuxiwefajup.weebly.com/uploads/1/3/0/7/130739023/9766258.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/08180f21-a9e6-40e1-ac34-c001e5c3cf00/barbie_dream_townhouse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdd4e95a-84ae-4ffc-bf0d-48977ef3fb9a/kapegozetarewisobikov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b133fe5-9da0-4624-a42a-eda5f3e9cdca/winx_flora_de_club_y_helia_historia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98988ad6-8109-48cb-ba53-7a0cc2da82b0/vcp_5.1_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ca352d6-0a41-42dc-9ea0-cdb19219cb01/slitting_wrists_how_long_to_die.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/repemu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/deabf9d2-1547-4b48-b78a-716845cdeb73/sniper_ghost_full_movie_2016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cc14011-ee9f-455e-ac1d-26adc0d0964a/15621922851.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/161c9b01-abdc-44e6-9361-7e8657419cbf/robiritifinajilijox.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_off00004264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4264 5244 bytes
SHA-256: ab7c91e3ebf8dfabb286a47f71cc2e33dbccd8456387a1b73852569287f98e87
font_01_sfnt_off0000544f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x544F 1700 bytes
SHA-256: 43cbd6a955ec2d537d9bd0fc1ebe56057c3be3c51da5f2d57f1f3f87a004e1d3
font_02_sfnt_off00005cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CC8 9696 bytes
SHA-256: 1b426ea657cc7a0c506f2edcca662c79c0e7ae756628439ba640065905210fd2

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