Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8eb3b3911b1a393…

MALICIOUS

PDF

101.6 KB Created: 2021-03-23 21:45:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a29f9a485b514787156b95315e79464 SHA-1: e635119b1fbabdfbfbcde1e141267d1535ee0391 SHA-256: d8eb3b3911b1a393e6dfc3cce0c2f963fa2e937ca3cabaea630aa928c3ec1228
156 Risk Score

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 designed to direct users to other sites. One such link, 'https://crophysi.ru/wix?keyword=immune+system+webquest+answer+key', is presented as a webquest answer key, a common lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crophysi.ru/wix?keyword=immune+system+webquest+answer+key
    • http://lazirawolewok.getenjoyment.net/zawove.pdf
    • https://cdn-cms.f-static.net/uploads/4450438/normal_604f0878b9e10.pdf
    • https://cdn-cms.f-static.net/uploads/4414500/normal_6055813da14ef.pdf
    • https://cdn-cms.f-static.net/uploads/4369506/normal_60412ec82d6f9.pdf
    • https://cdn.sqhk.co/pijujuweg/jhjjaB6/assistive_touch_ios_13.pdf
    • https://cdn.sqhk.co/gazegarov/5aoiaid/bizej.pdf
    • https://static.s123-cdn-static.com/uploads/4458829/normal_5fec0866debc2.pdf
    • https://cdn-cms.f-static.net/uploads/4444638/normal_6041ad04e35be.pdf
    • https://static.s123-cdn-static.com/uploads/4457312/normal_5fcf99019f7ec.pdf
    • https://static.s123-cdn-static.com/uploads/4443608/normal_5ffd9914c8934.pdf
    • https://cdn.sqhk.co/gavezexu/igl1Ohc/can_am_defender_hd8_crew_top_speed.pdf
    • https://cdn-cms.f-static.net/uploads/4476768/normal_5fe7aaef776d1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://52431b39-7396-4b0c-bcaf-ab72d449a1bf.filesusr.com/ugd/f8cef3_6a7947399b7643069218787e5f4f4489.pdf?index=true
    • https://s3.amazonaws.com/kakef/vanguard_index_funds_performance_2017.pdf
    • https://s3.amazonaws.com/kuxuxemu/toyota_yaris_2010_service_manual.pdf
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_e905d8dcabad407d81d31afc696a8908.pdf?index=true
    • http://biwosagamivi.myartsonline.com/47535313460.pdf
    • https://46d16763-6c5f-4e19-aa2c-3f4071fcbec2.filesusr.com/ugd/26f730_8667087aeb3246e7a81bfa1f62d9f5af.pdf?index=true
    • https://s3.amazonaws.com/sorapobuk/gerujeroladafolipiwi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014cca.bin
7cca68625366af0d8f939db13eb3847649023c8b2a55e028e3c9eab1ccee4e12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14CCA 5260 bytes
font_01_sfnt_off00015eb0.bin
4594016dc8c76cec3c8015802be33c801cff61b1d1be921243166a4082d46565		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15EB0 13112 bytes

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