Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cd244d71cbc4e4c…

MALICIOUS

PDF

70.4 KB Created: 2021-05-28 07:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8381c9549614c8e42680a2d68e05222 SHA-1: 7b9b0b7340934fec83c64fd17f4a9a2d1f37c56c SHA-256: 9cd244d71cbc4e4c53aee3cde9b9be72de3b9b75c12bab358db0e7c6efdb9fd4
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document, identified as malicious by ClamAV and an ML classifier, functions as a link farm. It contains numerous external links, including one to 'leonvi.ru', disguised within content that appears to be a weather report. The PDF_SEO_LINK_FARM heuristic indicates a mass of external links, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. No scripts were extracted, but the presence of external links and the overall structure strongly suggest a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://leonvi.ru/123?utm_term=caribbean+weather+report+for+today
    • https://cdn-cms.f-static.net/uploads/4371269/normal_6068ac9ca6629.pdf
    • https://gobodukigibab.weebly.com/uploads/1/3/1/8/131856162/3843816.pdf
    • https://pefojefevofat.weebly.com/uploads/1/3/4/6/134659321/8c17a2b54e0765.pdf
    • https://pinozawekik.weebly.com/uploads/1/3/4/5/134589254/2722295.pdf
    • https://mijolepeworid.weebly.com/uploads/1/3/5/3/135394353/1324018.pdf
    • https://figiroxofidun.weebly.com/uploads/1/3/0/7/130740151/mawemijazu.pdf
    • https://nakebakij.weebly.com/uploads/1/3/5/3/135339599/topemijubafosulavoj.pdf
    • https://cdn-cms.f-static.net/uploads/4374696/normal_606a6707cb590.pdf
    • https://static.s123-cdn-static.com/uploads/4420235/normal_6005ff51f036c.pdf
    • https://cdn-cms.f-static.net/uploads/4368266/normal_6040a7612ae2c.pdf
    • https://gasomuvujutomeb.weebly.com/uploads/1/3/4/3/134356107/6541910.pdf
    • https://dekoreriso.weebly.com/uploads/1/3/7/5/137501726/91b71.pdf
    • https://bedakowunuva.weebly.com/uploads/1/3/4/3/134342711/budokevisafuvevigoz.pdf
    • https://cdn-cms.f-static.net/uploads/4472768/normal_6037fd782c53c.pdf
    • https://jesodiretax.weebly.com/uploads/1/3/4/6/134659119/nuludazolis-jepebofar-kifinigatepesar-batipijad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/05792401-4e50-4a99-b70a-f697a6f08d94/how_to_reset_my_sony_nsz-gt1.pdf
    • https://uploads.strikinglycdn.com/files/b3ab2998-17f8-438c-8461-292db62468fb/84712152197.pdf
    • https://uploads.strikinglycdn.com/files/46bc9234-f26a-4373-8de6-ab4ac1d3db7f/toshiba_z930_blink_codes.pdf
    • https://uploads.strikinglycdn.com/files/07cc51fb-3697-4d4c-a76a-fe6608088495/bubanujusukejeg.pdf
    • https://uploads.strikinglycdn.com/files/868f5e40-ae6c-4d31-9115-53c84aaf9455/bokaxukebif.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d610.bin
8d65b0772cdd2e97de8b6f04c4269eb56800f0e6f84b93ccfb7042a1186b1d9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD610 5160 bytes
font_01_sfnt_off0000e7a9.bin
1091bdde9ec023db359e33c7939334722cd5e853523c3b1da1e3c609a30452c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A9 10628 bytes

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