Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ec85d4f1e542c71…

MALICIOUS

PDF

76.4 KB Created: 2021-04-02 03:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 00130c02d01bb6ea7bf19c1c3f17833c SHA-1: d9eb5f1586442bc1400d50def25dc0f8f70b316a SHA-256: 5ec85d4f1e542c71060673c0988503a520fa1c40634fd269d5a02f0d9cc127a4
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, indicating a link farm or SEO spam tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious redirection or content delivery.

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://cdn-cms.f-static.net/uploads/4481675/normal_601fb8da206f5.pdf In PDF document text
    • https://lorotorerusut.weebly.com/uploads/1/3/1/4/131452969/8144578.pdfIn PDF document text
    • http://myyshooop227.site/88832012712licya.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444358/normal_601e0a369cd7f.pdfIn PDF document text
    • https://zisugopijelides.weebly.com/uploads/1/3/1/4/131438068/4411720.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388608/normal_5fd66b8f9b704.pdfIn PDF document text
    • http://yourcy.com/are_zmodo_cameras_goodwrtly.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487386/normal_60038e5164b7d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484812/normal_5ff65d0433be5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384160/normal_604e4e6920109.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453907/normal_6014918401b99.pdfIn PDF document text
    • http://ighelperscenter.com/fuwinedutedakoresalodajefupin1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/dN4lCoxrs6M/wb?keyword=sony%20soundbar%20ht-ct%20260%20pricePDF link annotation
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_a8d12bbf092d47fa90db188c96ea0af8.pdf?index=trueIn PDF document text
    • https://53002a68-e35f-4167-ac88-1ab9777d7e72.filesusr.com/ugd/f5bc2a_ce051e9a5fe44ab2876b4bff949e506c.pdf?index=trueIn PDF document text
    • https://94226b1b-8363-4ad6-a779-e61b7b16ff5b.filesusr.com/ugd/b3bc21_f2b7ad76c67a4dedab0cf84162bad768.pdf?index=trueIn PDF document text
    • https://c7e723d0-7712-45a3-a8dd-8d8935e7c5e2.filesusr.com/ugd/c4f451_2f74ff829e74415681678cb50bda4e5c.pdf?index=trueIn PDF document text
    • https://874c0fd6-92eb-497b-905f-dc7ca4d2e287.filesusr.com/ugd/5ca7d4_dc6bdc25cc9d4d0c93875c193890c119.pdf?index=trueIn PDF document text
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_aad4d101d6884daab9b8626e6d745e7c.pdf?index=trueIn 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_off0000ecf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF3 5932 bytes
SHA-256: fab26da123824eff3b60be8fa63d9af5a6546bc59bdf6042fded85e9999c6e24
font_01_sfnt_off00010124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10124 10432 bytes
SHA-256: c966f7657d184b02ece8ce158bf750b709845dd405ecd005b5f4244128f4d2c1