Malicious PDF — malware analysis report

Static analysis result for SHA-256 7325dd0e03a3cd57…

MALICIOUS

PDF

68.9 KB Created: 2020-11-22 16:43:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 4012d00fd10d9c3cf872893ced56987b SHA-1: 7c678e355b3e821f641651fc484352b24dc1c496 SHA-256: 7325dd0e03a3cd578b76a4f26bf353a00be18e0f0f1f672f3701abc50ee824d7
214 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with one identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, suggesting a phishing or malware distribution campaign. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the presence of numerous links points to an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffmen.ru/123?utm_term=fire+emblem+6+chapter+9 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4480735/normal_5fa70be554aae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418796/normal_5f96382037a99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418558/normal_5f987a73562ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414677/normal_5fa949afc217c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503617/normal_5faf5c7d7d743.pdfIn PDF document text
    • https://rukazoxet.weebly.com/uploads/1/3/4/0/134040508/a9b5e753c2a9.pdfIn PDF document text
    • https://kugugurufive.weebly.com/uploads/1/3/4/1/134108893/debawatupu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b12b00fc-0be1-48cb-a955-0b03904d9ece/invitation_letter_sample_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/words_that_begin_with_qui.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/hasir_boi_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC54D 3544 bytes
SHA-256: bf631ac94abf842a85fd3824d6c6e5d7434f53f92825facda3aa7253aed7c862
font_01_sfnt_off0000d1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D2 5400 bytes
SHA-256: 9187f8a078c1480efda541fd80f8f75035b5f202aa8c25a202e481ca736a0141
font_02_sfnt_off0000e3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FE 10152 bytes
SHA-256: 681059ae861fe10e71078683dee9655ac248c693ab3efd764b770b785d7aa300

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