Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d39c99c976504a1…

MALICIOUS

PDF

70.7 KB Created: 2021-02-23 08:42:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 0bf4a7305c60c92663427450f2755aba SHA-1: 90fd02b6284357cdd07638674cedfcec83848faf SHA-256: 6d39c99c976504a1b3522394909d425d1770258193a75f4d8cfb489232e969cb
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • 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://bologen.ru/wix?keyword=la+ciudad+de+los+prodigios+comic+pdf PDF link annotation
    • https://wofovado.weebly.com/uploads/1/3/1/8/131871653/jazixare.pdfIn PDF document text
    • https://cdn.sqhk.co/fabozesemi/HchgKif/slots_free_online.pdfIn PDF document text
    • https://xigobiniliw.weebly.com/uploads/1/3/5/2/135298108/6e1656fc80.pdfIn PDF document text
    • http://f13x.xyz/what_does_p1_mean_on_toshiba_ac2n31w.pdfIn PDF document text
    • https://cdn.sqhk.co/waxobakal/imhdvhi/feliluj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371514/normal_5fdf4fc180204.pdfIn PDF document text
    • https://cdn.sqhk.co/tarudifirew/b7Q3I8L/fill_the_glass_without_touching_the_dish.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367290/normal_5fe58fd949451.pdfIn PDF document text
    • https://cdn.sqhk.co/fefowofuk/diaiblS/42994896939.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489852/normal_6011bd95368c0.pdfIn PDF document text
    • http://reduslimitalia-ufficiale.site/muwesiwometabiwekenixio0jrp.pdfIn PDF document text
    • https://fidagavatijib.weebly.com/uploads/1/3/1/3/131398583/a669b6be450858.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://petikagemejol.rf.gd/bilunijimigin.pdfIn PDF document text
    • http://wajodojizofe.epizy.com/15953621752.pdfIn PDF document text
    • http://pizoxuwa.epizy.com/71240301043.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_off0000d67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67B 5416 bytes
SHA-256: 772f4ff3ff92b551a2afe5dcb97e6885aecc87939ac0545fc0e10356f3e60648
font_01_sfnt_off0000e8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D2 11076 bytes
SHA-256: b5132082b599e554d6b5ea5791f741cfd5db404cdf424747b331cc7429ad1ec4

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