Malicious PDF — malware analysis report

Static analysis result for SHA-256 22281e7a14ee4ac5…

MALICIOUS

PDF

71.4 KB Created: 2021-04-04 12:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 2ad91fbfd41e01fd3a7630181d82fcc6 SHA-1: da8f9b0340a660e3e6cd17e5bbfffc8cdc16b064 SHA-256: 22281e7a14ee4ac5ebb6a74341926f80b06ff00f6024e0809984aff13f549493
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many of which are part of an SEO link farm designed to redirect users to potentially malicious content. The primary lure appears to be a 'Parker knife price guide', which redirects to a URL associated with phishing. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution.

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
  • 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.
  • 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://xajibur.ru/wix?keyword=parker+knife+price+guide PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/line_graph_worksheets_2nd_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/66652411045.pdfIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/dixujotevabifem.pdfIn PDF document text
    • https://cda84be5-0c54-4c05-8389-97bb004c798d.filesusr.com/ugd/fa9f00_3dce08fcf9f545c6877912550dfa4f27.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bupijila/handlettering_alphabet_vorlagen.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/robat.pdfIn PDF document text
    • https://ddd59a73-be73-4575-bd7b-2e5900175f8b.filesusr.com/ugd/5dc0ef_ba2ad62f14b245f3b3498aaddb2b0769.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/xixuguz.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/599079547.pdfIn PDF document text
    • https://2987c0f4-171e-4473-b3f1-a5468658115b.filesusr.com/ugd/75ff8a_d7666673cd54488795e6b8c8373f6b8e.pdf?index=trueIn PDF document text
    • https://0621cc9e-6449-4e8a-a8bd-baee9ad62a2c.filesusr.com/ugd/affb4a_8056dc16a73f4e0eac6da9fb9b1d1339.pdf?index=trueIn PDF document text
    • https://9462281c-6212-45c1-8f90-c4e3c363a226.filesusr.com/ugd/007d40_77cffa56b17f4ed5a25404a407966d9a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/rekenejogoxirukosimep.pdfIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/47306246494.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/graphic_design_portfolio_template.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/lonekos.pdfIn PDF document text
    • https://s3.amazonaws.com/kovibu/50804233542.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_off0000d713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD713 5180 bytes
SHA-256: f206d0f1d3bf0bfe52947228f0278f0ae160e5692225fd19e01ed66bcfca34ac
font_01_sfnt_off0000e8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C4 11344 bytes
SHA-256: 5c1f5128a569efceb94037ded8ea1c90b677dbd7cb8fb9172eec715e3e0a802b

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