Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f922edc4b1b6882…

MALICIOUS

PDF

78.7 KB Created: 2021-02-16 00:12:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 398c9e124816637a9a49c73962002982 SHA-1: 22648f635e3c44fc54fe0bd4553c4285dfee8d46 SHA-256: 4f922edc4b1b688241e59d25f8b90e01e4aa6c26bec45bc18ba1c2056c676049
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to what appears to be a link farm designed for SEO poisoning. One prominent URL, 'https://leonvi.ru/wix?keyword=vpn+melon+apk+download+latest+version', suggests a lure for downloading an application. The presence of ClamAV detection and ML classification further supports its malicious nature, likely involving exploitation for client execution.

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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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://leonvi.ru/wix?keyword=vpn+melon+apk+download+latest+version PDF link annotation
    • http://gratoramaa.website/harvest_manjula_padmanabhan_charactersoj683.pdfIn PDF document text
    • https://cdn.sqhk.co/migazajigum/heiaSgi/12795099913.pdfIn PDF document text
    • https://nudilosi.weebly.com/uploads/1/3/4/5/134527742/8552079.pdfIn PDF document text
    • https://tunilawogipafex.weebly.com/uploads/1/3/2/8/132814387/pikip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468261/normal_5fe9ea5a23c4f.pdfIn PDF document text
    • https://degezumibupupek.weebly.com/uploads/1/3/4/8/134862322/1a6f7a3dd.pdfIn PDF document text
    • https://guwubujurod.weebly.com/uploads/1/3/1/4/131438509/9457812.pdfIn PDF document text
    • https://xikewewojan.weebly.com/uploads/1/3/4/0/134095915/acd87d2.pdfIn PDF document text
    • https://cdn.sqhk.co/noviraxat/1ZhbVjg/dwts_cast_2019.pdfIn PDF document text
    • http://help-violation.com/48761510683250f7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/96856910434.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/greers_ferry_lake_walleye_fishing_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/annotation_guidelines_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/sosawo.pdfIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/37279891053.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/asuhan_keperawatan_hepatoma.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14E 5288 bytes
SHA-256: 1db8f31682a9b95ef2e8ff556f1aec6a7e13fd80db51e1aee3f2982c9d515bc7
font_01_sfnt_off0000f349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF349 10736 bytes
SHA-256: 92ef368dfc98b96f67137795ec96a9c1bf30b16c8ec942b2861865186b31a744
font_02_sfnt_off0001183b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183B 16232 bytes
SHA-256: 0b4f0929fd87ab9a0aeeeb9215df101e242f4725806bcc0bc4e777280dd6ae7e

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