Malicious PDF — malware analysis report

Static analysis result for SHA-256 c19fff8148705957…

MALICIOUS

PDF

72.8 KB Created: 2020-11-19 07:20:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: ee103a866ea9221c4298def8c857c4e4 SHA-1: ee2d6beb162a101bee697a876e9321a4db93ea10 SHA-256: c19fff81487059571bc7a3b00bcf29f16017d18a880f170d0b4f3796f5c9440c
254 Risk Score

Malware Insights

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

This PDF file exhibits malicious characteristics, including links to known malicious redirector infrastructure and a large number of external PDF links, suggesting a link farm or SEO poisoning attempt. The heuristic 'SE_CLIPBOARD_COMMAND_LURE' indicates the document instructs users to copy and paste content into a shell, a common tactic to trick users into executing malicious commands. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware distribution attempt, likely involving the download of a second-stage payload.

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
  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://gettraff.ru/aws?utm_term=calendar+excel+vba+userform In PDF document text
    • https://cdn-cms.f-static.net/uploads/4489045/normal_5fb54be958da9.pdfIn PDF document text
    • https://xulajaxosu.weebly.com/uploads/1/3/4/3/134366267/wobazuza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405467/normal_5fabcdb7adaeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448995/normal_5f9f3b0f8e0c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370319/normal_5f8c8f000af9f.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/bezegoluzose/marvell_magni_driver.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/everfi_credit_score_final_quiz_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/vurokogovoramowupasele.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2189f083-30fc-4995-981c-bde5996de026/etapas_del_conflicto_dramatico.pdfIn PDF document text
    • https://s3.amazonaws.com/wovisak/guitar_hero_world_tour_setlists.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/toxabigupo.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/rafixulebixa.pdfIn PDF document text
    • https://s3.amazonaws.com/wovisak/78755075482.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e297a68-632c-4f78-b3b3-fc362e3394a9/14042154992.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/nebugazadojo.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_off0000e0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A1 5340 bytes
SHA-256: 3049655594a2186d2fdc3cde83ea16bef0d179a4b7b4a20e1c34b811483c125d
font_01_sfnt_off0000f2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B7 10340 bytes
SHA-256: f147c0b3ff80ffddbae632b51cf2120c44baad217cd7e02675e609c087a77bdc

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