Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b969682962bd9b7…

MALICIOUS

PDF

44.6 KB Created: 2020-11-06 09:04:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-15
MD5: ae36f092c0c884bc7e5ac13ec9af691d SHA-1: 67572c02b1cf88dbceddd0ee8a936e299acec1a4 SHA-256: 3b969682962bd9b71c7a8c8738c46b12677c261d814eef9bc6578aff7e59382d
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=download+minecraft+pocket+edition+apk+android PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366319/normal_5f95031e45376.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387411/normal_5f96d99394a08.pdfIn PDF document text
    • https://negofugino.weebly.com/uploads/1/3/4/5/134529575/gitezati.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375889/normal_5f99b5f3e9087.pdfIn PDF document text
    • https://guvefivilemu.weebly.com/uploads/1/3/4/3/134397682/wukudeloto-kugel-katulodaz-mikazoposaw.pdfIn PDF document text
    • https://xetutinafo.weebly.com/uploads/1/3/0/7/130775845/vagaritisimuwubono.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414339/normal_5f9971a6354a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389606/normal_5f944d6f186cc.pdfIn PDF document text
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/2937143.pdfIn PDF document text
    • https://pudefita.weebly.com/uploads/1/3/4/4/134476078/8968949.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372719/normal_5f8a01eacabd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417140/normal_5fa472cbe7bd4.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/lunojol/a1294_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/mulunitunegomijimavonu.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_off000070a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70A8 5280 bytes
SHA-256: 2b215e6ed09bd45c360134d78786fb7c59342f59ef79fe003323eaf5d7e42af4
font_01_sfnt_off000082a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82A6 10200 bytes
SHA-256: 4b8e72b7178b198cc20e629761b1a035a3145da1fa806c887f5ce354066cb552