Malicious PDF — malware analysis report

Static analysis result for SHA-256 38a9cf3d0ddec5c1…

MALICIOUS

PDF

37.8 KB Created: 2020-11-07 14:44:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 3528d1c8d5d8795beb41740982bd8899 SHA-1: 7af678d765a0a9326459328b0a5d247b7486e9c6 SHA-256: 38a9cf3d0ddec5c126ecee5b266c97e12c88fe61a3eefa8e709d08ee25364396
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/123?keyword=pac+xon+deluxe+hacked PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374002/normal_5f8b771ac6be1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374840/normal_5f8a4cd9d6479.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/5086b991-84ca-43a2-967a-0fd04b1a040b/xowove.pdfIn PDF document text
    • https://tafelataxuka.files.wordpress.com/2020/11/56251540919.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb6b2cca-b21b-4853-83b7-5f47b5fc4ae6/13365424555.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79ac289b-417f-410d-8d4c-206093449f3e/serum.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/63731620780.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/673031e7-4e00-4c70-a1b3-6eb8a90e1299/cartoon_network_summer_resort.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/burger_king_gutscheine_sterreich.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b5fd3f4-eea1-44ef-b17f-145a52a97a2b/burin.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4278 4884 bytes
SHA-256: a342c70c55025426f61e38fc19399378b1d366c79870ad70892ce8db0202c74e
font_01_sfnt_off0000530e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x530E 10204 bytes
SHA-256: e74f280bd033ef52da290d754f5856e8b1b40bbcc043e02a3be3ad7098befa80
font_02_sfnt_off000075cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75CF 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073

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