Malicious PDF — malware analysis report

Static analysis result for SHA-256 fde08f3fcf3a9839…

MALICIOUS

PDF

77.9 KB Created: 2021-04-05 07:33:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e0617b2d0e788737056b731e0e7e81d0 SHA-1: b3182005ce6b7c4652f8a53a370473c5100916ae SHA-256: fde08f3fcf3a9839e8ebe932b95b479bd4ef9588434c19478f80e38520e3229a
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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.
  • 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://kuzutuzo.ru/aws?utm_term=how+to+help+son+with+anxiety+and+depression PDF link annotation
    • http://flathead.us/55679447513hcnvy.pdfIn PDF document text
    • http://ukranews.icu/fisifafirijc54ab.pdfIn PDF document text
    • https://duvedibis.weebly.com/uploads/1/3/4/1/134131600/buxuboxila-nanuloken-gafuzipijumapov-nodivofulegik.pdfIn PDF document text
    • http://metapilunax.iblogger.org/4001668516.pdfIn PDF document text
    • https://wegakerovosa.weebly.com/uploads/1/3/0/8/130873826/5ef28c4ef.pdfIn PDF document text
    • https://natozimokuwepef.weebly.com/uploads/1/3/4/3/134398015/6527141.pdfIn PDF document text
    • http://onlinekartiadesi.com/pabapagafojixozg2hff.pdfIn PDF document text
    • https://tikepewovexa.weebly.com/uploads/1/3/4/3/134317170/fawimejani.pdfIn PDF document text
    • https://tubuwixufadone.weebly.com/uploads/1/3/5/3/135315283/vifosojikemisub.pdfIn PDF document text
    • http://meetsol.xyz/garmin_zumo_660_map_updateiszj0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gigoxasogoteje.epizy.com/on_the_origin_of_species_short_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/55192710529.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/20789746068.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/bigulaxigavirogumujiwakep.pdfIn PDF document text
    • https://692937ca-140d-46b9-9715-018e108c1018.filesusr.com/ugd/2540a5_2f3fff3a0d82462c93f8e28e46b7aafb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/27781043486.pdfIn PDF document text
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_b06165d4620e4d2e983a7fcfe7497c01.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kavalukato/33956837204.pdfIn PDF document text
    • https://1a447ccf-a6a5-490c-ad31-399ae8169532.filesusr.com/ugd/cf5184_87ab4237e4424fc880fd0ef4e900341a.pdf?index=trueIn PDF document text
    • https://f07eb630-23ff-4298-a1df-d7940f1ba2dc.filesusr.com/ugd/097a5b_7598959c17334a3a8c0992eec6a490be.pdf?index=trueIn 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_off0000f44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44E 5272 bytes
SHA-256: 99f56ecb121a6f585a0582be6272c992eaa0156940d3dc0c2921aacdca530479
font_01_sfnt_off00010645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10645 10608 bytes
SHA-256: c1bbf3463d0d442ab9a267b2803056c40a28dfa0e02b38758be5c7a41546552a

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