Malicious PDF — malware analysis report

Static analysis result for SHA-256 bde521858852d813…

MALICIOUS

PDF

76.0 KB Created: 2021-02-13 04:23:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a5a41e807b819e608e5ba61f359ac208 SHA-1: b0a10063d2b6cf6be5de93b54e8d6670bcde55ac SHA-256: bde521858852d813658e4b68c83c5de06f50fd7d307a507665d5e147f64c09b9
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://druttle.ru/wix?keyword=osmosis+and+diffusion+lab+report PDF link annotation
    • https://kelebewo.weebly.com/uploads/1/3/4/3/134359650/2707321.pdfIn PDF document text
    • https://cdn.sqhk.co/gufemazibafi/fhcjjBD/smarteefi_wifi_smart_switch_board.pdfIn PDF document text
    • http://bbflowers.net/dofakedavipudigakuzobaxppj9w.pdfIn PDF document text
    • https://dofazodasi.weebly.com/uploads/1/3/0/8/130873943/xakagoradovu_faxodelosexilag.pdfIn PDF document text
    • https://cdn.sqhk.co/remowiwa/fihidbL/42257405126.pdfIn PDF document text
    • https://kelogukagikuval.weebly.com/uploads/1/3/0/7/130739039/3948341.pdfIn PDF document text
    • http://gnatural.space/kismet_train_collision_reportkijl2.pdfIn PDF document text
    • https://bufoteno.weebly.com/uploads/1/3/4/8/134851237/366532e08c9cab.pdfIn PDF document text
    • https://masiwirisiniziz.weebly.com/uploads/1/3/1/4/131453333/8809978.pdfIn PDF document text
    • https://cdn.sqhk.co/mogidamiko/GsJhj7e/steampunk_tower_defense_hacked_unblocked.pdfIn PDF document text
    • https://sawuwirepugasup.weebly.com/uploads/1/3/0/9/130969548/zufozaw.pdfIn PDF document text
    • http://look-hotel.com/cassation_decision_volume_18y3zqu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tiniruru/11091866396.pdfIn PDF document text
    • https://s3.amazonaws.com/firudegix/xigalo.pdfIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/2881873912.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/86244793985.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_off0000df4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4F 5236 bytes
SHA-256: 06ea8e67f19a73cdd08651176621c89a9c54dce8970f6f1a9b7d943ecb25438e
font_01_sfnt_off0000f0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F3 10408 bytes
SHA-256: 15eb0446a7b7b144e25b3fb1adba1e5e8e599ebaccaf5cf91523096e3ba27cb2
font_02_sfnt_off00011467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11467 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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