Malicious PDF — malware analysis report

Static analysis result for SHA-256 da143ba3aa72c465…

MALICIOUS

PDF

77.3 KB Created: 2021-02-08 19:19:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 8919bd32c36824d426c78ac0f4ec707d SHA-1: 31d4b26bc0036e2ee9455eaf4195c17f740d0163 SHA-256: da143ba3aa72c465d9905df0a2fcc86accf756619bd52863faed2c710eb3cafb
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/aws?utm_term=learn+basic+spanish+language+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393900/normal_600f0f041079a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370055/normal_60111f3f2cdd0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472774/normal_5fe5f88e73fc0.pdfIn PDF document text
    • http://cybety.xyz/timodufotomitiguwixexatvbbw.pdfIn PDF document text
    • https://tabogivazosepa.weebly.com/uploads/1/3/1/8/131871767/4072516.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375087/normal_5ffc4e01460b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450507/normal_5fe7e78fe46b5.pdfIn PDF document text
    • https://wamonudikiso.weebly.com/uploads/1/3/0/7/130776885/9067458.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486060/normal_6006f7de1a600.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/dosalapasenow/jopuzuseduwimotozino.pdfIn PDF document text
    • https://s3.amazonaws.com/fidobakipivogit/36997481820.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/jasupugaginivojotuvut.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/lugipaselalebiju.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/bukoxixepowuwafokasami.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/69987375915.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_off0000f2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F0 5496 bytes
SHA-256: fbf83b2b56fa555bc42bb4891f278363babf855b9d87ea6506c51d671374c311
font_01_sfnt_off00010599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10599 10268 bytes
SHA-256: 4c32232ec936719330d429d616a6e541bffb21ccd16cdea4a5f2c83dd89e426c