Malicious PDF — malware analysis report

Static analysis result for SHA-256 d769ddfde23a735d…

MALICIOUS

PDF

79.4 KB Created: 2021-06-12 11:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 918b8e1e2ec71ee4744c7a5cda215fea SHA-1: 6ab7b677855e87d771f0bc47f04ec7b83d852d7d SHA-256: d769ddfde23a735dde44ff9f8744a8978d3cfe01521934d4338a2aaee88458d2
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially malicious sites, possibly for further exploitation or credential harvesting.

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
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://smidgel.ru/pbw?utm_term=mixed+parts+of+speech+worksheets+with+answer+key+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495399/normal_5fdb56c16ef8e.pdfIn PDF document text
    • https://kixasakuzejud.weebly.com/uploads/1/3/5/3/135347884/detebulenenesiv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413473/normal_5febce61353cc.pdfIn PDF document text
    • https://dalenorilesa.weebly.com/uploads/1/3/4/8/134858788/6467405.pdfIn PDF document text
    • https://botamelojobowi.weebly.com/uploads/1/3/5/3/135344227/239dbfee40c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445871/normal_601e93e53f436.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424689/normal_6013b4367a0dc.pdfIn PDF document text
    • https://wubenigulusetib.weebly.com/uploads/1/3/4/7/134712949/7600881.pdfIn PDF document text
    • https://vodefuba.weebly.com/uploads/1/3/4/6/134688083/nelibimixodamav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443602/normal_606dfc4d92d0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403679/normal_6062bdd478bff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383160/normal_601bb30dd51d6.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/87c8d85a-2a5d-4af9-8682-972b3d0318c5/4197758412.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7953b48b-7286-4f66-b5aa-4e39fd6c7f51/is_ableton_or_fl_studio_easier_to_use.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5af338a7-51c2-483d-900d-48265df6d488/descargar_crack_para_sketchup_pro_2014.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99a01ba6-c8f7-4c43-abd7-7acbe1519f2a/the_skin_deep_questions_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47c08ab8-42aa-4f34-b3e5-de790daa8603/how_to_pronounce_basic_korean_words.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b0832e1-7a04-491f-9a7a-e9bfdf90cd3f/good_transition_words_to_start_a_sentence.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fbc6aeb-bfc6-41f9-b0ce-4aa050a3ada8/audio_technica_at-lp60xbt_replacement_stylus.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE189 5544 bytes
SHA-256: 84c86b60da6b2cb2fcfd2b9d9e0eb429287783117f41727f87a150fa4326fdd3
font_01_sfnt_off0000f485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF485 11188 bytes
SHA-256: 3af00425cc4826635d5820c529f6381f43afe639eee078643beb3a949b03a456
font_02_sfnt_off00011ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD1 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848