Malicious PDF — malware analysis report

Static analysis result for SHA-256 22b97551241bb683…

MALICIOUS

PDF

70.9 KB Created: 2020-11-09 23:15:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: e190407b5a7666699d8b2bb65e858c39 SHA-1: 1940288e2167a49d05ebb8adb8480656845b49f7 SHA-256: 22b97551241bb68303751789f7b4e47df74477b0864099580735c2d02f4f10cf
214 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure, specifically 'https://ggtraff.ru/aws?keyword=sample+award+nomination+letter+for+employee'. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to employee awards, aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ggtraff.ru/aws?keyword=sample+award+nomination+letter+for+employee In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383703/normal_5f9192049eb0d.pdfIn PDF document text
    • https://kaxalosenawa.weebly.com/uploads/1/3/4/5/134576513/5838889.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374860/normal_5f917ad266a7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374521/normal_5f9669f25fa28.pdfIn PDF document text
    • https://vifesomojijafi.weebly.com/uploads/1/3/4/3/134337648/dikosoxivegud.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/negonanopix/keurig_3000se_users_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/snooze_fort_collins_vegan.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/sandwich_police_department_nh.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e60bcd22-7db4-436b-9c14-95773ad85eee/fifipagibiluruwiximobo.pdfIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/notosowalopezurutopanolej.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/georgia_secretary_of_state_ucc_filing_search.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/rorogekuxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04d1529d-7b28-4245-9c46-22205aa1caef/30011449729.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_off0000dba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA0 5304 bytes
SHA-256: c42a540bd2cfd836fe377c3e5ff8681a4864be99f5f849710e930442ea9cc627
font_01_sfnt_off0000eda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA9 9640 bytes
SHA-256: b886214744b32f094ce722c92af2b8236f13a9089e29829e27e834d6f354c673

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