Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf53d31ea8a9f71…

MALICIOUS

PDF

69.1 KB Created: 2021-02-08 11:10:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 5757bc9ed0eb154ae8561208f068918f SHA-1: f4e34a99918c9e2ea79ddf519253b8719fe358c7 SHA-256: 7bf53d31ea8a9f718d611996466ca5ba6947f21b7e0731af3922883ab2751f88
254 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
  • 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://crophysi.ru/wb?keyword=ambi%20pur%20air%20freshener%20safety%20data%20sheet In PDF document text
    • https://cdn.sqhk.co/noxisoture/a26igjd/82523917450.pdfIn PDF document text
    • https://cdn.sqhk.co/kegufamop/TheihgB/58717789369.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454435/normal_601877a3709f2.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/jfhcgfc/94225498958.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377925/normal_5fdf00c79039c.pdfIn PDF document text
    • https://nujetamewude.weebly.com/uploads/1/3/4/8/134881912/zumazefakazosagax.pdfIn PDF document text
    • https://nodejobirutita.weebly.com/uploads/1/3/4/7/134748641/juzedusafu.pdfIn PDF document text
    • https://nefirekemoziwep.weebly.com/uploads/1/3/4/3/134332842/vukujexu_mifoloxig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473030/normal_5fcbc6458526e.pdfIn PDF document text
    • https://busekedogipu.weebly.com/uploads/1/3/1/4/131454033/3430d4c95f050.pdfIn PDF document text
    • https://lejigatoni.weebly.com/uploads/1/3/1/8/131871980/6645392.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/jakujakula/32135730190.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/sample_format_of_affidavit_of_guardianship.pdfIn PDF document text
    • https://s3.amazonaws.com/gopifu/78939520264.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/24832084870.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_off0000d226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD226 5480 bytes
SHA-256: 82e7282994413f911c91a40f01ca8ae27f256dc119b61c0658d5421bce2eddb7
font_01_sfnt_off0000e4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A0 10212 bytes
SHA-256: 38b8ec770d48833539a0f7374000a2e51ee3ff415c613c4e2cd39c71bedaa72a

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