Malicious PDF — malware analysis report

Static analysis result for SHA-256 984e7e75ac4deb77…

MALICIOUS

PDF

70.9 KB Created: 2021-02-03 23:52:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0fe44a6e61a8bfece5511bab56aab756 SHA-1: c412a57e12c1c01331cf528dbed54f1c239c96ed SHA-256: 984e7e75ac4deb7795bd1c7a401e2514fb630285cf29f83eb71b4c281d96fede
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'Master forge electric smoker parts' and is generated by wkhtmltopdf, suggesting a lure document. The presence of numerous links to disposable hosting and the ML classifier's high confidence score further support a malicious intent, likely for phishing or malware delivery.

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://yafferge.ru/123?utm_term=master+forge+electric+smoker+parts In PDF document text
    • https://static.s123-cdn-static.com/uploads/4383138/normal_5fff3a2e3cc3e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481164/normal_5ff8634e297b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370073/normal_5fd10e3897197.pdfIn PDF document text
    • http://podarokinsta365.site/korigozimupunakugifcamq5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487432/normal_5ffbc224a30e0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485929/normal_5fe518b791ee8.pdfIn PDF document text
    • http://kyhni.site/wefuv3yh8g.pdfIn PDF document text
    • https://cdn.sqhk.co/dovoxukeni/ghih3gv/4_pics_1_word_photo_frames.pdfIn PDF document text
    • http://microbestdigitalmeter.xyz/gebeloni8h1e3.pdfIn PDF document text
    • http://rafale.store/haitian_radio_stations_in_port-_au-_princethftp.pdfIn PDF document text
    • https://cdn.sqhk.co/gukugifixija/gchfTPl/aluminio_fundido_en_ingles.pdfIn PDF document text
    • http://ihsteam.ru/html_tags_in_gujarati0vfng.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/potamotaz/latest_6th_pay_commission_report_karnataka.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/febebafamivakamadax.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/ragnarok_mobile_alchemist_stats_guide.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_off0000d53b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53B 5404 bytes
SHA-256: b560aa93a5b513a56d42c55db3d5c2d18202c74688c8483f05ff1bcd8175cc14
font_01_sfnt_off0000e79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79F 10872 bytes
SHA-256: 32c4c569d32c12e8c6376ea1e43defb0025b89371a5d1d30ce23a6fc000dad08

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