Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bf513e0b33d259c…

MALICIOUS

PDF

80.1 KB Created: 2020-11-16 14:40:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: ed72d64173a9e3a122fe663c563b2596 SHA-1: 3c6020375381274caf8677794ba5d014be1a0e24 SHA-256: 1bf513e0b33d259c972be5a3e904fbc8804e4fafcc155f4601399c6b47fab9f7
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafficel.ru/123?utm_term=bibliografia+mla+de+un+libro PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369647/normal_5fa8a826bbaa3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369499/normal_5f95cac033265.pdfIn PDF document text
    • https://kizujaxaluw.weebly.com/uploads/1/3/4/3/134393650/4024211.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380413/normal_5f9785a48c4a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372399/normal_5f9756e7ed591.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411220/normal_5f95d00d26e84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426572/normal_5f9b14e21b44c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381962/normal_5fa031a199192.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/tuxutedi/wulawefomuvur.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/donavalerekugemivitamupe.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/key_root_master_apk_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/mod_menu_for_fortnite_apk_xbox_1.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/5759110946.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_off0000f7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E5 5240 bytes
SHA-256: 8b1aba29a6c382f64c3fe6bb5b6b9964dd78afa19cd1f348ff482b139fe7caed
font_01_sfnt_off000109a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A6 13004 bytes
SHA-256: a078cfe699ff0b20af31d219b2546555c5267a168eeebc8d55341375afa632b6