Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e149fb6b324c009…

MALICIOUS

PDF

84.9 KB Created: 2020-12-26 20:15:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: ef81321f2624c3cdf869ee9e19582105 SHA-1: 35e7996d9e8673fb7546794fcd71cc589a411b8f SHA-256: 3e149fb6b324c0092f4ec23cd4a48fb8c162ec41ea2d67a6ff5b027141688d81
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The presence of a large number of external links, identified as a 'PDF_SEO_LINK_FARM', suggests the document is designed to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malicious redirection scheme.

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://trafficel.ru/123?utm_term=knuffle+bunny+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452217/normal_5fd2e77154aa7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402250/normal_5fa63221ad41b.pdfIn PDF document text
    • https://cdn.sqhk.co/xezojutatow/3Hihhhj/4_pics_1_word_4_letters_eagle_lion.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369793/normal_5fd9c7adc36ce.pdfIn PDF document text
    • https://finiruxadaral.weebly.com/uploads/1/3/2/6/132680938/vebixosivurat.pdfIn PDF document text
    • https://cdn.sqhk.co/fokivetezabu/bfhiTha/refuvipu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423148/normal_5fa14a928bc28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368479/normal_5f8aa387da998.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378608/normal_5f8d4e318892f.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/5215dfa7-4684-48d4-a8a2-ab6d46dd5740/xuwavuzof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10df5686-dd55-447e-affe-b889551d423b/rapewakosesuxexipajok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/150c672f-db42-4063-b6bb-3409fe8a4223/carrier_infinity_96_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4a2fe17-a5b6-4c85-aa36-6af9df6de58d/32678246198.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a59a1aa7-1268-419e-be5f-34cbf43dff10/80442589925.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caa5e7c7-a93b-4d00-99b5-21a93de847b2/84681562620.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_off0000eae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE7 4764 bytes
SHA-256: ffaf299afad1bcdbafbc4be0fec1c7a1f8998a9aa5eb63ea41a4e38640084f0f
font_01_sfnt_off0000fb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3F 12840 bytes
SHA-256: 98c13997e4cd218c7cd099dcd19c2e13e65687fa30e27027a46519dd7da89117
font_02_sfnt_off0001253d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253D 19776 bytes
SHA-256: b3b2fe310c0bf096f639fc7011425d27744544826e0ff6bbc62e93176f94566b

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