Malicious PDF — malware analysis report

Static analysis result for SHA-256 63f84160c9fa09f4…

MALICIOUS

PDF

71.2 KB Created: 2021-06-01 06:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4677d33fae843a625e04216551185f27 SHA-1: 756febdf3a506b451fe965ec52b93fe66f519034 SHA-256: 63f84160c9fa09f459f9a4ee77f0a132aabd497584db102150d15dea6ecb0e9b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm used for phishing or malware distribution. The presence of embedded JavaScript, although not fully analyzed due to obfuscation, likely facilitates the redirection to these malicious sites.

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://gimoguvi.ru/123?utm_term=hey+soul+sister+trumpet+sheet+music PDF link annotation
    • https://laxonetamaj.weebly.com/uploads/1/3/4/0/134096763/9780288.pdfIn PDF document text
    • https://rokerisokexojud.weebly.com/uploads/1/3/0/7/130738924/2bcad468.pdfIn PDF document text
    • https://nesoximitegemaw.weebly.com/uploads/1/3/5/2/135295679/texogunatotemi.pdfIn PDF document text
    • https://wibizoginoj.weebly.com/uploads/1/3/2/6/132681485/2425319.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453579/normal_5ff97d9a15542.pdfIn PDF document text
    • https://xavexipaw.weebly.com/uploads/1/3/1/6/131636683/kasiwabesunugu.pdfIn PDF document text
    • https://pekupepavipojev.weebly.com/uploads/1/3/1/8/131872203/dapufikinilelup_boredofem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494888/normal_6059eeb389633.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415334/normal_6059dd3991083.pdfIn PDF document text
    • https://jiburivaduvu.weebly.com/uploads/1/3/4/4/134473865/nerawurozuxexap.pdfIn PDF document text
    • https://zofijakifixanow.weebly.com/uploads/1/3/4/6/134677560/7725450.pdfIn PDF document text
    • https://radoxawema.weebly.com/uploads/1/3/0/7/130738714/8529168.pdfIn PDF document text
    • https://weziriditovi.weebly.com/uploads/1/3/4/1/134108838/gavotetibavafa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479921/normal_5fec14fd6578f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484356/normal_5ff42681e3ed0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427086/normal_604cdfef28fb8.pdfIn PDF document text
    • https://fekunifiso.weebly.com/uploads/1/3/4/2/134266639/228ea6f0.pdfIn PDF document text
    • https://tuvepovuno.weebly.com/uploads/1/3/3/9/133997374/ab8e8d989c4a0d.pdfIn PDF document text
    • https://piroveda.weebly.com/uploads/1/3/2/7/132740505/9374302.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_off0000d69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69E 5028 bytes
SHA-256: 2a623c916900160413f16aa4fbd4441df74ea516b970d89f0188489cc78207e9
font_01_sfnt_off0000e794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE794 11196 bytes
SHA-256: e36548205aff71b8280556dff0990df5cf3f27625c9fbe7ee41691bbd471e212

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