Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a6a8d61abe74e66…

MALICIOUS

PDF

51.8 KB Created: 2020-11-09 02:49:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: aafa72fd75739e5605db8b88f8935be2 SHA-1: 7c40680b298ac6691739c149193a90c1090b05bc SHA-256: 5a6a8d61abe74e66fd50626b085fa5b35c6897ee53e4148d8cea03685836fe3b
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=sly+cooper+clockwerk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366007/normal_5f8996982226c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412773/normal_5f9f08f73f543.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472206/normal_5fa8755610e8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374699/normal_5f905699eb2f9.pdfIn PDF document text
    • https://dizegixevovule.weebly.com/uploads/1/3/4/5/134576191/4578974.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368979/normal_5f8b15c61f723.pdfIn PDF document text
    • https://fufivivol.weebly.com/uploads/1/3/0/8/130873849/8615e86.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/classic_wow_prot_warrior_leveling_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3081e94-a2eb-4665-8894-6700f576cc84/sefevodabojevafawe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9c89924-ff15-4707-98b1-860be8a19bae/lubedudafikeki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3e63f42-2fdf-4f47-bfde-2c7934734653/terebigexefodobit.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006de2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE2 4900 bytes
SHA-256: f30c35032ce6278692d0c29d4609b02a8a1d69c30abb4e04ecb2c1879218f08b
font_01_sfnt_off00007eb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EB6 2208 bytes
SHA-256: 6feae600816abf1bc5af351fc67f77c29147a154af04638e5d7145d083d074dc
font_02_sfnt_off000088db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88DB 10996 bytes
SHA-256: 8ea6cd1d4ad37dc93bb985c7f3570ff5f38e9e47156f2499318122b540095890
font_03_sfnt_off0000ad8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD8D 16076 bytes
SHA-256: e619a639363efb8a8c499d9b10964d1cd014b9e04bc729d500f2b798c8236684

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