Malicious PDF — malware analysis report

Static analysis result for SHA-256 3816311f78a8cc96…

MALICIOUS

PDF

44.6 KB Created: 2020-11-09 14:06:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 7cd2d20847c88092a5cca8140bf3dab2 SHA-1: 82449e29a3992590c30b065cef58b66b69f5680a SHA-256: 3816311f78a8cc9655c5b8e42f561a8c22f0a0454fc300b3d37603dd55a4f87f
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://trafftec.ru/123?keyword=ge+cafe+dishwasher+manual+gdf+570-650 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369655/normal_5f900e01cb79c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417669/normal_5fa11ca45cd8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366399/normal_5fa8bf3bdfe34.pdfIn PDF document text
    • https://lirebuzufosol.weebly.com/uploads/1/3/1/4/131453665/medibizironode.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375352/normal_5f9418f608601.pdfIn PDF document text
    • https://korodaziso.weebly.com/uploads/1/3/0/7/130740443/4923221.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369663/normal_5f962e6805462.pdfIn PDF document text
    • https://zuvagenujak.weebly.com/uploads/1/3/4/4/134454716/zujuboxazugubofonexe.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/zuses/household_budget_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/abituriyent_jurnali_8_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/wunujuwitelirepan.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/fivizuwapisifawixivoreti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96204551-a17a-4151-a980-ebcd8e7bbd54/understanding_stocks_michael_sincere.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33cb7f95-4959-4644-9edd-a5b2f3e3c94b/nuguzofefetedinidonijaful.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_off00005e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E5F 6092 bytes
SHA-256: f562ec8bd4c247667108cdd230ac8c31679a15779df2544f3d0dd45a86aa67a8
font_01_sfnt_off00007313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7313 2088 bytes
SHA-256: 517af5a120279a6ed2f41569a3aed9ea8c40a14ac425266371261dd5a77304ba
font_02_sfnt_off00007c2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C2B 11824 bytes
SHA-256: d3aa1823a6f83db1b5c141d2a861669af2599b879dee4a48fe437f5fee6e2795