Malicious PDF — malware analysis report

Static analysis result for SHA-256 151f397bcceea3de…

MALICIOUS

PDF

80.1 KB Created: 2021-02-14 06:05:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: be38c9569d427a06517d850f285d9321 SHA-1: d65dae2738c2b29259f5acc6e77f8381365dfe5a SHA-256: 151f397bcceea3deeb0e5f76baf993af3307267334309aa230729edbc8de8594
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to link farms and redirectors, indicating a phishing or SEO manipulation attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. No scripts were extracted, but the presence of numerous external links is the primary indicator of compromise.

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 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.
  • 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/aws?utm_term=format+xml+in+notepad+7.+5.+6 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4493589/normal_5fda656af4105.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470828/normal_5fd805e774418.pdfIn PDF document text
    • http://storeeu.info/einstein_quotes_wallpaperdcq9q.pdfIn PDF document text
    • https://cdn.sqhk.co/vabalogu/QhjhgOs/subway_surfers_world_tour_paris.pdfIn PDF document text
    • https://visopitolunew.weebly.com/uploads/1/3/1/4/131483219/7005000.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453902/normal_600b723fa9e8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461525/normal_6022028d53152.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482872/normal_601db1f99d577.pdfIn PDF document text
    • http://kpovli.ru/kumusugexabopenetilopb7nwl.pdfIn PDF document text
    • https://cdn.sqhk.co/pidagasew/fjbjjB7/80438329914.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487662/normal_6017fa16c7da8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404310/normal_6000e5cb6eaf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384482/normal_5fd7a76f39c42.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382771/normal_5fc9d760cf3df.pdfIn PDF document text
    • https://cdn.sqhk.co/madagijoj/gcijphb/gt_mountain_bikes_for_sale_cheap.pdfIn PDF document text
    • https://cdn.sqhk.co/fijajiles/TAlVJrV/divegelazesokepivola.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47A 5340 bytes
SHA-256: 10bab8a7e2c7bcdb95f416fc869063d50821fdd76de74b569ba9b2aeaf974632
font_01_sfnt_off0001069e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069E 14004 bytes
SHA-256: 1b718062e90c176da9747736cd352649a4ce37f0095a8de5e8bfd2ef7cc2e307

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