Malicious PDF — malware analysis report

Static analysis result for SHA-256 53ae6b5d9ada43e3…

MALICIOUS

PDF

74.3 KB Created: 2021-04-28 06:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8290ed72e4ec81e5d241c4cf1c65cb2c SHA-1: 155ed8fcac44d2a10b4a920f8b311222edc7e9c4 SHA-256: 53ae6b5d9ada43e385cafd873d660483e6b996d2eafeaa2a42d8fa495f6b5327
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://lozipotod.ru/strik?utm_term=the+secret+law+of+attraction+full+movie+in+telugu PDF link annotation
    • http://gatorama.space/50829721005t63tb.pdfIn PDF document text
    • https://tonituligavu.weebly.com/uploads/1/3/4/8/134884188/4851773.pdfIn PDF document text
    • https://filukekab.weebly.com/uploads/1/3/4/4/134478490/8978854.pdfIn PDF document text
    • https://mivifasev.weebly.com/uploads/1/3/1/4/131483453/74c84c5e528f.pdfIn PDF document text
    • https://rurasaza.weebly.com/uploads/1/3/4/8/134869927/pibopagunevuj.pdfIn PDF document text
    • http://fodanavi.22web.org/letaxexokebixutamasise.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413473/normal_604f799d3074b.pdfIn PDF document text
    • https://waxalema.weebly.com/uploads/1/3/4/3/134364729/1b6b5187b9.pdfIn PDF document text
    • https://wesedujixezibo.weebly.com/uploads/1/3/1/6/131606467/madonitixujuzum.pdfIn PDF document text
    • http://cleaner360.shop/sony_str_1030_manualo24fs.pdfIn PDF document text
    • http://zidujut.22web.org/46003536446.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447280/normal_6000477e179cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457582/normal_60481c9349050.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423452/normal_60292140d2af3.pdfIn PDF document text
    • https://vedexojofidas.weebly.com/uploads/1/3/4/5/134581268/50f677281.pdfIn PDF document text
    • https://gidapozu.weebly.com/uploads/1/3/1/3/131379371/megikupibokitib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pimibini.epizy.com/nuxunazibunezezuxawif.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_off0000e6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A5 5396 bytes
SHA-256: 770c3ba44ac180abbc9d331486ef2fcd6d59b8cfe53282fc5037eee4c41d704c
font_01_sfnt_off0000f8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F4 10536 bytes
SHA-256: 2b6940e0379a5fb984c86d1c7b83bbf174740235e233b623c8e15fa62fcad676

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