Malicious PDF — malware analysis report

Static analysis result for SHA-256 a544e4ada2378037…

MALICIOUS

PDF

41.6 KB Created: 2020-10-01 23:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: f79acb8a8253ba5bb096bebd1ce704b7 SHA-1: d3fa10f180c8046f596f8b839183b501aeac9414 SHA-256: a544e4ada2378037810f0e1d3a0de9b9dde89ffea43a0fefd14ed84fa45ba093
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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://cctraff.ru/strik?keyword=2009+harley+davidson+ultra+classic+s In PDF document text
    • http://ketam.champsinhaiti.org/uploads/1/3/1/6/131606490/0a93938cefe.pdfIn PDF document text
    • http://rumegokus.lindasueharper.com/uploads/1/3/1/8/131856149/98df0186cf.pdfIn PDF document text
    • http://files.freewheelspa.com/uploads/1/3/0/7/130740458/wepalosamulif.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/67337507-d6c6-4156-a267-313c3aaa1479/74321193860.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c0d7311-f2b0-4b04-b290-10490447a0c2/31196371681.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d69ac9a-b012-4130-85fb-afa2d43e7a02/sufejogevotewozofezomit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6cda605-7020-4c0c-8a38-74c6fcebca9c/wonanofoserusafilefako.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0218e24e-13f4-4bb2-89da-b1e1c29be05f/44516427387.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fdbb0f2-04ca-44db-a2a6-42bf97762edb/90390112786.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c239b43f-9e88-41f0-9186-226b58b512fb/ferekasojotelutona.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba6314f8-38c9-4f14-877d-919b97d26bcf/71937401210.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b67b1d8b-3f6b-4848-9d34-b86fc50943a5/gudemuvenufuvig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e65f9e85-c875-4ffc-88f9-97aa1f684892/gakosuwukatopupakunuvig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7a7e84e-c00c-454e-919f-47f550238986/wafudugeluv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3facbf8-6a48-4831-b56b-a13aa917805f/jisufuvufopixameme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5f0fcd7-f57b-4059-ad76-f41cd8ca27bf/71181126644.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73a92068-2077-41de-94c5-a0771f09c87f/zoluwogawon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e1735ff-912d-4508-ad16-080d04d6f52f/sunaso.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_off000062df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62DF 5524 bytes
SHA-256: 911625bca40cf60cf7123e8571769b8012732903850cc5936af5bc9687594576
font_01_sfnt_off000075a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75A7 10436 bytes
SHA-256: 2aa94c03b385ced56843c66afe6692e969b49dbd816114f60d020b7bee2192f7

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