Malicious PDF — malware analysis report

Static analysis result for SHA-256 76f13ca3ed11faf6…

MALICIOUS

PDF

72.7 KB Created: 2021-02-10 02:03:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: c71b50e1d40785f519d70890a0221ef9 SHA-1: 88d059293c0e12b08b57859384599d96866ee9ee SHA-256: 76f13ca3ed11faf60fde40f27ded9517261a5f07b13b309af618ebd39a500040
254 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wb?keyword=bmi%20calculator%20app%20free In PDF document text
    • http://getporte.xyz/lizardmen_guide_warhammerfgy08.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501233/normal_60038a8d3804e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408184/normal_5fef0b50a0486.pdfIn PDF document text
    • http://edapog.online/widcomm_bluetooth_driver_for_windows_7_64_bitbnda9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374978/normal_5fcd0bf406ec5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501356/normal_600020ee2eebe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386613/normal_6000cd18c56f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462075/normal_600e92ca25175.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422145/normal_5fcbe75463474.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475874/normal_5fe19372734ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391317/normal_5fd8d9a89f0b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385427/normal_5fe9b6de6af30.pdfIn PDF document text
    • https://xulomonixibeneg.weebly.com/uploads/1/3/1/4/131455416/pexizakawu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://filexumif.epizy.com/beethoven_sonata_17_allegretto_sheet_music.pdfIn PDF document text
    • http://mekidojakad.rf.gd/4060544107.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_off0000e04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04E 5032 bytes
SHA-256: 884b3341f7b74e77102278eea715b03740ac40de6ed54ba94ffb6fa46a7c6e46
font_01_sfnt_off0000f158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF158 10692 bytes
SHA-256: 3f104d96f122c62079a04d85ae96bb6b6c1f1aaf73ca4b7ff698408a395308a9

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