Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ca255045e426129…

MALICIOUS

PDF

78.6 KB Created: 2021-05-29 06:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: ecd73f06c46543ee8db3ec01f6500541 SHA-1: 73e5f959bc6c9d16e8e3ce46715c710b0b3e7b10 SHA-256: 9ca255045e426129b360e60627b8fa4a70b71712091982f2b3fd933b725ceae6
196 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 Weebly and s123-cdn-static.com domains, suggesting a link farm designed to redirect users to potentially malicious content. The presence of UTM parameters in some URLs indicates a tracking or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://botokaw.ru/123?utm_term=filmywap+2017+punjabi+movie PDF link annotation
    • https://jivexine.weebly.com/uploads/1/3/1/3/131380908/daropexetalufow_mapafofuve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529024/normal_601dbc1542e21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421329/normal_5fde3e1d1ec37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372737/normal_600fd5aa695e7.pdfIn PDF document text
    • https://tuxenovizomojow.weebly.com/uploads/1/3/7/5/137516496/5901595.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366630/normal_605044b75b90a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368770/normal_603569ec2037e.pdfIn PDF document text
    • https://rizomoxus.weebly.com/uploads/1/3/4/5/134589692/mezuxavusofidoralan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478688/normal_5ff350ee7f700.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413004/normal_6032f02cb7d9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452851/normal_605bc8f1d91bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491687/normal_6067152065531.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472764/normal_605016e688584.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383586/normal_5fcedf8043b28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418362/normal_606bc88596125.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414353/normal_6013d80b27f12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491670/normal_602aef813420c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392218/normal_600c59a5da65c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443610/normal_6032f3fef391c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404490/normal_5ff2349baa379.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389606/normal_600771f02ba1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484835/normal_605549c7db84d.pdfIn PDF document text
    • https://xizilajonufu.weebly.com/uploads/1/3/4/5/134528384/3148525.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_off0000f559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF559 5520 bytes
SHA-256: ab8f68cc99ea7aecb80af6d47c474f8c99cc5b64a67d5b2acb1538808d0e5d5b
font_01_sfnt_off0001083a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083A 10836 bytes
SHA-256: 8486c3c7820240ff0a9e78d7d8b7f5629e8d41bca0c200f2e744c631dae71d1c