Malicious PDF — malware analysis report

Static analysis result for SHA-256 0491a3d97e528831…

MALICIOUS

PDF

44.2 KB Created: 2020-11-06 22:23:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-15
MD5: 283d7d25115aac1e9bbcfff01b837c87 SHA-1: 69aa452b29b3b95626595e701f065de5b5d3e9ed SHA-256: 0491a3d97e52883147724d570b8a0b536c113a53a3869e1230ef334f21ac68f6
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=etrex+30x+manual PDF link annotation
    • https://juporolo.weebly.com/uploads/1/3/1/3/131380745/717030.pdfIn PDF document text
    • https://sepikupi.weebly.com/uploads/1/3/0/7/130738949/7583260.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/6814b7ba-c7a7-4264-b8b9-cc420441768b/11720695110.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/ferat.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/lurumofidefikegegax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6e0f8d4-4409-400f-a712-af567de4a361/favubetan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2788f09-6244-4cd5-bd09-de8dd402bd08/putasa.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/amenaza_parto_pretermino_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/83401265012.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71841971-7f8e-4013-a13c-04f60c0049e5/how_to_summon_a_succubus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43141fe2-2e1b-4f70-a2e3-7db9f8e7a358/65688763374.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/mutadisilat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48e22e1a-7755-4148-b7c3-a945f736ace5/76968298017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09688860-e8ae-449d-b4b7-cf6897cbee33/34099093636.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2798c039-b39a-4f54-a425-4b2877104e5d/83916560785.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c362dd6b-c521-42a0-ab18-fa3c16cdcbf0/revavufosominurironatep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2f82bc4-5100-4813-b3e1-aabce44a4fde/61617208968.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E10 4984 bytes
SHA-256: c0cb09adc44aae999087e0a7e934e963d2e473bfa885de57144c96f9a9f788da
font_01_sfnt_off00007ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EF4 10924 bytes
SHA-256: b32dcb6fb39a48d56a878b4c6ef9baf0bd6649068d2900e55f8457416b53d9f4

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