Malicious PDF — malware analysis report

Static analysis result for SHA-256 19ad39bcd31a43e3…

MALICIOUS

PDF

61.7 KB Created: 2020-11-06 04:06:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-03-01
MD5: 7394b8b955e8c1912c17380bf7452aad SHA-1: 2d0b0eb161a10684e5a6ec163b5a1f664b2ef50e SHA-256: 19ad39bcd31a43e39841e6c7a641748b94a8c435268e8a705844ae8ed20d75f8
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://trafffi.ru/aws?keyword=the+filthy+rich+guide+episodes PDF link annotation
    • https://tibiwurab.weebly.com/uploads/1/3/2/6/132695994/9904545.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377377/normal_5f95643e441d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366399/normal_5f9fade04f97e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369769/normal_5f8eda96a2ea5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420448/normal_5f98cbf646163.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370785/normal_5f8df62b8d100.pdfIn PDF document text
    • https://sifizebutu.weebly.com/uploads/1/3/0/8/130814914/2075510.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426820/normal_5fa41b30a1d3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466379/normal_5fa3c8a1d26b6.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/jajoxulabojaso/skip_bo_rules.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/montana_landmarks_for_kids.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9530/3365/files/fodoriteliwe.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/oakland_raiders_2020_nfl_schedule.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_off0000adac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADAC 5260 bytes
SHA-256: 8adeaf08480254cdb52f1849691091ddfc7d82e6a071b0f461a551540fe04af7
font_01_sfnt_off0000bf98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF98 13104 bytes
SHA-256: a1126d746160f46073a2887f50f2299b0c06f86e0c593a6eab1bce9316ed4e38