Malicious PDF — malware analysis report

Static analysis result for SHA-256 eca17eb15e2f5fac…

MALICIOUS

PDF

126.2 KB Created: 2020-11-22 20:46:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 31f06390bcae08ce91a9aaa967c1c379 SHA-1: 31963b817b0c385f9ae241fe63e8a1c1cd10625f SHA-256: eca17eb15e2f5fac019b0a0339aca24b0c934a6628be3e849ec2caaaa2ce6bd7
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded links, with critical heuristics identifying it as a redirector and a link farm. One of the primary links directs to 'traffking.ru', flagged as malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffking.ru/123?utm_term=order+of+magnitude+analysis+boundary+layer In PDF document text
    • https://laxozutamof.weebly.com/uploads/1/3/4/7/134748247/8411376.pdfIn PDF document text
    • https://lobevebuwavija.weebly.com/uploads/1/3/4/3/134394718/bce5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407081/normal_5f9cb3ffbcbdd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450630/normal_5faa7a51d9b1c.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/webipejonavuv/saaho_telugu_video_songs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/514b3244-5205-4ebd-a489-b957af9816fb/3969121674.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d169b60b-239a-47be-a065-2093ea58c403/fudapopemezetep.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/rarolupujebetugefujujute.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/12222152439.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/65856209720.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/preparation_of_aniline_from_nitrobenzene_lab_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb3b237b-6f34-4152-a4cc-94e3d8e2e446/49210452360.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001505d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1505D 23544 bytes
SHA-256: 5119c7d03611f48e6c955befd5ce784e39359098d623ffba01f2da9ddb481bbb
font_01_sfnt_off00019469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19469 5496 bytes
SHA-256: c501645e575e51c5a08d21347e24b138991fe790a9bed3895351526e4d3c5687
font_02_sfnt_off0001a703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A703 14256 bytes
SHA-256: aba9af108cd554143a65ac0198d5f8bb989248ebd35c95a26a2ce1120212ca94
font_03_sfnt_off0001d6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D6A4 16112 bytes
SHA-256: 04c641d0aedeaa8c494855f42a2e9ae6fad9e3679126e7dc5c08fccc4b41c292

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