Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a24a9a4076f5bf…

MALICIOUS

PDF

81.1 KB Created: 2021-05-18 03:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1c5759a279107a86dbe8b0a08015fad6 SHA-1: b083c2cdaa6f2759cdf9f41097dba9b80ba54516 SHA-256: 16a24a9a4076f5bf38bc4e2a3a503ded0239e1fda6960b1db3c6e34cc1554819
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, which is indicative of a link farm designed for SEO manipulation or malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/strik?utm_term=quran+all+surah+mp3+free+download+with+urdu+translation PDF link annotation
    • https://gusumumonabol.weebly.com/uploads/1/3/0/7/130775475/bowolixaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401973/normal_605a471358c81.pdfIn PDF document text
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/gogexemomixam.pdfIn PDF document text
    • http://bibuwobu.22web.org/akai_mpc_essentials_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368468/normal_605db8fe80592.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367941/normal_6046356586a02.pdfIn PDF document text
    • https://putesoborufo.weebly.com/uploads/1/3/0/8/130814126/7867407.pdfIn PDF document text
    • https://melivuwupazadog.weebly.com/uploads/1/3/4/7/134721584/fuxamatinadawabazabo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452381/normal_5fcb369032bd8.pdfIn PDF document text
    • https://kodidorimo.weebly.com/uploads/1/3/1/3/131380292/05c3bcdff38d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501634/normal_602ab94d3e63f.pdfIn PDF document text
    • https://fupelesanu.weebly.com/uploads/1/3/1/6/131606305/3248600.pdfIn PDF document text
    • https://zolowokixo.weebly.com/uploads/1/3/0/7/130738875/4626780.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450438/normal_60321b1df0c0a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vunowowino.epizy.com/cours_anglais_bac.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/43145381387.pdfIn PDF document text
    • http://wonumamirevaz.rf.gd/xamaxek.pdfIn PDF document text
    • http://zagasazibizit.epizy.com/jibokoxa.pdfIn PDF document text
    • http://relanofog.rf.gd/jilunuw.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/accomplishment_report_template_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/lososimap/17598459127.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A6 5596 bytes
SHA-256: 4ea8b11995e647e5bb761f30edd96033b08f8ba8896e1bd84ec160e9f5c37775
font_01_sfnt_off0000f889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF889 7876 bytes
SHA-256: 9ebd7914eb9d6cba5628abf2e866d93a7dbba5cb61f1edfa3d5e3237b0a78e0c
font_02_sfnt_off00011150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11150 10216 bytes
SHA-256: cf39e064ee6aed8c518fa25b154ed41c9a5e7a8adcfe77c723a3664ab1545f50