Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfa796841c9a823f…

MALICIOUS

PDF

69.7 KB Created: 2020-12-21 01:43:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: bc12737a6da1d1d6828414f3922d687d SHA-1: 66187509d45753b00752b3786a5f838817a8906a SHA-256: bfa796841c9a823f6cbcd4c4e6727f16ed664e7068f51b1b3e0b1fe22a8ad1d7
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. The primary URL, 'https://trafftec.ru/aws?utm_term=reservoir+induced+seismicity+ppt', suggests a lure related to 'reservoir induced seismicity'. While no scripts were explicitly extracted, the presence of PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS firings, along with ClamAV detection, strongly indicates malicious intent, likely for SEO manipulation or phishing.

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
  • 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.
  • 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://trafftec.ru/aws?utm_term=reservoir+induced+seismicity+ppt PDF link annotation
    • https://wibizoginoj.weebly.com/uploads/1/3/2/6/132681485/343375.pdfIn PDF document text
    • https://fegilekupajot.weebly.com/uploads/1/3/4/4/134404616/2de1f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417025/normal_5fa5644d5f058.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381297/normal_5fa17e1438dfc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496380/normal_5fcd56ca48ff2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366381/normal_5fb2de0c39359.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466370/normal_5fa320b9337d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365608/normal_5f9925bf4023e.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/1b45c867-4d55-4541-9e00-d3518bbe774f/jusigumunetipodaselo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d399a68c-2313-4d0a-bff7-9783f63e254e/language_of_peru.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5489c403f5353fdb28927/t/5fc61d6f5147b14804038c71/1606819184642/super_mario_world_3_online_emulator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4f52971-9355-4d81-9a7b-c48f416cfa9d/ziwekowekigolasetixorewof.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4c82e6d49a06bb883108/1606372483753/vevawovelosudado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0a49680-3322-4bf0-b2ef-b391e4cafe4b/nixifurulovupuwanufasi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc6c610b-cf5f-4cda-bc5a-c430fcf40b52/38459234880.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/575250a5-137b-4453-8457-1071ff84943d/sowosatodamexudu.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_off0000d3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B5 5148 bytes
SHA-256: 28d4acb74a1162d77d463697051fbe200261220688760b58deca4801a528c61c
font_01_sfnt_off0000e535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE535 10732 bytes
SHA-256: fc70253861a768ff149d5ed07db2e59f246b203520e747177a189f76933cc4b0

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