Malicious PDF — malware analysis report

Static analysis result for SHA-256 97edbd8b5a202d0d…

MALICIOUS

PDF

71.6 KB Created: 2021-02-17 02:40:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c0b3deb7d0b691e561f0884a2d31d630 SHA-1: b146546ff17dce3579ee164003b1ef6fcd7decfb SHA-256: 97edbd8b5a202d0d39d66fb4b5c4d34746d24c74b26a7f41ad38b2d8ecb574d3
184 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirectors, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, appears to be a lure related to pricing, suggesting a phishing or scam attempt. The presence of numerous links to disposable hosting further supports a malicious intent to distribute harmful content.

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
  • 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 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.
  • 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/strik?utm_term=how+much+does+storm+doors+cost In PDF document text
    • https://static.s123-cdn-static.com/uploads/4365642/normal_5ffd6091bfb17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446774/normal_602c1287a447c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489969/normal_5fe8045c6129c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409806/normal_5ffbdb5dc2a10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501963/normal_6018ebb06d189.pdfIn PDF document text
    • http://onesmall.space/omron_bp742n_5_series_advanced-accuracylotcd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367680/normal_5feffb8463b8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418391/normal_60240925648e2.pdfIn PDF document text
    • http://segwaywheelchair.ru/lesisarfha7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481663/normal_6009fb8c730c7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://girodolud.rf.gd/soundtap_streaming_audio_recorder_2._11_free.pdfIn PDF document text
    • http://nibudomatimemi.rf.gd/nawijiletorimu.pdfIn PDF document text
    • http://wosunitiguzivef.epizy.com/behance_android_app_design.pdfIn PDF document text
    • http://xixujoteb.epizy.com/best_simulation_games_android_free.pdfIn PDF document text
    • http://sekupudim.rf.gd/murijifiwoxax.pdfIn PDF document text
    • http://biborufa.epizy.com/43120975117.pdfIn PDF document text
    • https://s3.amazonaws.com/wixatax/98409657918.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_off0000dd8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8D 4988 bytes
SHA-256: 971fa1c5c710b74ecc6d4eb79be3378a2f2b681422b2cacd12f6c38621ef07fc
font_01_sfnt_off0000ee6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6B 10320 bytes
SHA-256: 5b4c5f629424221e4d24a76ac1658d99c890d45efb82a58922702398bca61191

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