Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f48d3ad17fa8ca5…

MALICIOUS

PDF

46.6 KB Created: 2020-11-07 05:13:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 2c53d39f5e4d55daec037e24df2af7ae SHA-1: d3f530524e3612f457133d892196c093a413656b SHA-256: 9f48d3ad17fa8ca528ce0729ac9da35c7adea8d3d48fdef013e058d9d6a874ef
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffking.ru/aws?keyword=animal+jam+codes+for+items+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388819/normal_5fa600f543ed6.pdfIn PDF document text
    • https://suzokapiwewop.weebly.com/uploads/1/3/4/3/134351383/nurofisigasonaw.pdfIn PDF document text
    • https://pezosoxebigaxox.weebly.com/uploads/1/3/4/3/134337327/xobovadi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374175/normal_5f9ff8d849bea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408721/normal_5fa5e12d0fce2.pdfIn PDF document text
    • https://lefedatit.weebly.com/uploads/1/3/0/7/130776734/51b492995ed215.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365539/normal_5f8f84b877009.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367313/normal_5f87e760d63b1.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://suvarofora.files.wordpress.com/2020/11/95519257918.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e13a66d7-685b-4acc-bfad-02fc032c4950/5462131747.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/nutiga.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/nc_license_plate_agency_west_market_street_greensboro_nc.pdfIn PDF document text
    • https://karepoxazul.files.wordpress.com/2020/11/52691102935.pdfIn PDF document text
    • https://nasudapopu.files.wordpress.com/2020/11/goldman_sachsin_operaatioanalyytikko.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_off000069e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69E5 5292 bytes
SHA-256: 1b37b65516d8e1cc9fab3e249e8198ce8f17b9ed795602b84ea40e3a25ad2a5c
font_01_sfnt_off00007bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BB4 10324 bytes
SHA-256: 8e1ea8c65e9158074808419ce2ae47c71986294b6b4e8c9fa71714abb5d29665
font_02_sfnt_off00009f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F10 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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