Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bbf66a11399a6ca…

MALICIOUS

PDF

77.2 KB Created: 2021-06-11 01:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 80a45b46c6ea84e5886ca2917a497cab SHA-1: 3e5603c2f4e55560c1185f9715dad1fc891316b4 SHA-256: 3bbf66a11399a6cad8968d30d44d430a7e4e926a65d19769c1a118da1bd3d22f
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 pointing to disposable domains, which is characteristic of a link farm designed to attract traffic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URL suggests a lure for downloading software, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://synerhu.ru/pbw?utm_term=real+car+parking+hd+mod+apk+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388819/normal_6017dc0fb542b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374366/normal_6035fef13709b.pdfIn PDF document text
    • https://vizudenorip.weebly.com/uploads/1/3/4/6/134674315/8422635.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385197/normal_606aa39eb7185.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452595/normal_60159346d5cd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487626/normal_605b9bb2121c3.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4468536/normal_60b28952e5577.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410190/normal_6067dd2b4f1d3.pdfIn PDF document text
    • https://javabudonoban.weebly.com/uploads/1/3/2/6/132683403/wipazenekavavozoxezo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453342/normal_5ff02a35d48f1.pdfIn PDF document text
    • https://ladulokepalixu.weebly.com/uploads/1/3/4/8/134878898/9012570.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bezidoxumoru.pbworks.com/f/72592487090.pdfIn PDF document text
    • http://wemilamozede.pbworks.com/w/file/fetch/144555009/wilorowobosid.pdfIn PDF document text
    • http://finatin.pbworks.com/f/little_black_baby_boy_haircuts.pdfIn PDF document text
    • http://fulusivijomu.pbworks.com/f/soluciones_hipotonicas_hipertonicas_e_isotonicas_ejemplos.pdfIn PDF document text
    • http://lefilep.pbworks.com/f/plantilla_rayas_para_escribir_recto.pdfIn PDF document text
    • http://tusawijer.pbworks.com/w/file/fetch/144449496/kopukasarukurinas.pdfIn PDF document text
    • http://gibuwodebu.pbworks.com/w/file/fetch/145084134/the_isley_brothers_discography.pdfIn PDF document text
    • http://vonodatob.pbworks.com/w/file/fetch/144718626/lisefunobubilujamus.pdfIn PDF document text
    • http://mapaduzipi.pbworks.com/f/what_was_the_primary_goal_of_the_2009_affordable_care_act_quizizz.pdfIn PDF document text
    • http://povelin.pbworks.com/w/file/fetch/144888882/33424765557.pdfIn PDF document text
    • http://fotikeralo.pbworks.com/f/gubiwikefezuzanib.pdfIn PDF document text
    • http://joraxakegeg.pbworks.com/w/file/fetch/144923733/javoxuvesizijurukinov.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F4 5472 bytes
SHA-256: a89d834ff4f6531c3e078753fc039e1e9e56507e7ab77f75fe8a7caafb86b0b6
font_01_sfnt_off00010576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10576 9980 bytes
SHA-256: d775183ee926231ce586b331e87dc99a1b5512b56a9dd714b82afba38426a24b