Malicious PDF — malware analysis report

Static analysis result for SHA-256 a577fe4edcf9aee7…

MALICIOUS

PDF

69.2 KB Created: 2020-11-22 22:30:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: c727197cd75f1eb7ac03e4ee404c542a SHA-1: 15f4e02d53c689210f19df11d1138a19ceedf5ec SHA-256: a577fe4edcf9aee73ce7f1bf8463d42e0cd48669e961052b625820dc735d3579
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gettraff.ru/123?utm_term=define+cold+war+hotspots In PDF document text
    • https://cdn-cms.f-static.net/uploads/4389090/normal_5f9710920182a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446762/normal_5fab901d3492b.pdfIn PDF document text
    • https://derodaju.weebly.com/uploads/1/3/1/6/131606282/femizetakuta.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376600/normal_5f8cbc3db5eae.pdfIn PDF document text
    • https://pirulilepeno.weebly.com/uploads/1/3/4/0/134040853/41832ab1188d073.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372737/normal_5f89ea803ed95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374537/normal_5fa5c99518608.pdfIn PDF document text
    • https://xularidamilizal.weebly.com/uploads/1/3/4/6/134685918/fuvere.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487622/normal_5fa954cae2c3c.pdfIn PDF document text
    • https://tofejigijo.weebly.com/uploads/1/3/4/3/134312142/bbb47ccb9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/351736b1-9da0-43d1-8956-46efdaa53fdc/yaralanmalarda_ilk_yardm_slayt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/158b5da5-87f7-4b5d-a6e9-a173d138e786/35433178567.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9c9191d-0c69-46c1-b654-cc13641516d4/97147458419.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_off0000d1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F0 5336 bytes
SHA-256: b91b65d122e4850bfb0298d89670392c9119672183d3ec56a33d9b619f02e3d5
font_01_sfnt_off0000e429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE429 10508 bytes
SHA-256: 60ecd36bc599c0aa173e7593eabc92ccc5b5a7bf07242195a7c40518f76cf20a

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