Malicious PDF — malware analysis report

Static analysis result for SHA-256 516abcb9625bcbaf…

MALICIOUS

PDF

66.9 KB Created: 2021-03-28 09:20:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 023433603b401d57fb7cbe47bb1893fb SHA-1: f590b1a263b47b0ee845d6f47bc907e94402d5bd SHA-256: 516abcb9625bcbaf476769e1f677cd6eedbbd31f1f5e9d1104cbb3f7811a8d3b
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to various domains, many of which are hosted on disposable platforms like Weebly and CDN-sqhk.co. This behavior is indicative of a link farm, likely used for SEO manipulation or to redirect users to malicious content. The presence of a link to a known malicious redirector further supports this assessment. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=aaru+songs++in+tamiltunes In PDF document text
    • https://nunewefumeko.weebly.com/uploads/1/3/4/3/134307525/vukufi_lenusudejiwagi_kosozabamo_fokela.pdfIn PDF document text
    • https://sokijolixorinus.weebly.com/uploads/1/3/1/1/131163896/3875729.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453718/normal_5feca0cb495f7.pdfIn PDF document text
    • https://vitovoraf.weebly.com/uploads/1/3/1/1/131164311/mufipibukugiluzodino.pdfIn PDF document text
    • https://cdn.sqhk.co/xanapaje/jhihdWi/jepizoromajowuwudamag.pdfIn PDF document text
    • https://cdn.sqhk.co/kedetofido/9ghxFjb/astigmatismo_regular_e_irregular.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481985/normal_601121729d34a.pdfIn PDF document text
    • https://nuvisinuxaxo.weebly.com/uploads/1/3/1/3/131383681/6517146.pdfIn PDF document text
    • https://cdn.sqhk.co/wuwovodegi/fstQ4jc/basic_electric_guitar_chords_chart.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485576/normal_600a8fa855c85.pdfIn PDF document text
    • https://sedapelagug.weebly.com/uploads/1/3/4/1/134109100/fodomabipudavuti.pdfIn PDF document text
    • https://cdn.sqhk.co/wolebiduju/iUjc7bF/rudevidololo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376866/normal_5fe010bfc4a6c.pdfIn PDF document text
    • https://xekurisiwa.weebly.com/uploads/1/3/4/4/134401096/laporeka.pdfIn PDF document text
    • https://cdn.sqhk.co/rufosopufu/4jgJhb6/raxanukogasogorefitapizo.pdfIn PDF document text
    • https://sowozulame.weebly.com/uploads/1/3/4/7/134733070/4375480.pdfIn PDF document text
    • https://diniporugixufov.weebly.com/uploads/1/3/1/8/131856235/putokeloxutofiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370080/normal_6022297081298.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_off0000c9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CA 4996 bytes
SHA-256: 925c8b9304748c2076363198785dc7c68fcb61a14ec9c08a8ccefda8043c0bfd
font_01_sfnt_off0000dab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB2 10544 bytes
SHA-256: 14e3b13a8984770de404435d9a579a5b7d13fda6fe9acefdad3e73774d8af258

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