Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa6a6b0daa085507…

MALICIOUS

PDF

75.0 KB Created: 2021-04-05 12:41:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4d44fb768eb836d8d63209f492542b19 SHA-1: 09849e6fdd79941e20dc4a39be3e273e6ad67998 SHA-256: fa6a6b0daa085507f9e32886364e0344fcb63f377a8e15b97ed54938d3f4a284
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://xezojetit.ru/award?keyword=cambridge+past+papers+o+level+pdf PDF link annotation
    • https://ludugekokokak.weebly.com/uploads/1/3/5/3/135313409/3197101.pdfIn PDF document text
    • https://luruxelu.weebly.com/uploads/1/3/2/6/132682974/wagan-xidowexajimix.pdfIn PDF document text
    • https://bijefalatobin.weebly.com/uploads/1/3/4/6/134629646/992079.pdfIn PDF document text
    • https://xuzonikafu.weebly.com/uploads/1/3/5/3/135351414/d13aac174672a.pdfIn PDF document text
    • https://vesabigixovo.weebly.com/uploads/1/3/1/8/131857304/jexejefed.pdfIn PDF document text
    • https://zizonilorixu.weebly.com/uploads/1/3/4/7/134772478/2683603.pdfIn PDF document text
    • http://ligexekena.mywebcommunity.org/diccionario_juridico_universitario_guillermo_cabanellas.pdfIn PDF document text
    • https://dugufenejoropez.weebly.com/uploads/1/3/0/7/130775504/sajinisona.pdfIn PDF document text
    • https://wewiruvikaju.weebly.com/uploads/1/3/0/7/130775929/2c71c0c8b4c9.pdfIn PDF document text
    • http://fumatiw.mypressonline.com/current_affairs_2020_in_english_free_download.pdfIn PDF document text
    • https://worijuxadije.weebly.com/uploads/1/3/4/8/134863955/dezukolunipu_liferupos_duloregupuzovas.pdfIn PDF document text
    • https://xanugobolenaz.weebly.com/uploads/1/3/4/3/134371028/fugopujukedixo.pdfIn PDF document text
    • https://virutabadipepuv.weebly.com/uploads/1/3/1/3/131398083/zowusevunu-funanukunulaj.pdfIn PDF document text
    • http://pirewarekow.mywebcommunity.org/meaning_of_business_communication.pdfIn PDF document text
    • https://ganegekisawaji.weebly.com/uploads/1/3/1/4/131406809/fojitasotikatovozij.pdfIn PDF document text
    • http://fozivot.mypressonline.com/89881049767.pdfIn PDF document text
    • http://zikewexer.scienceontheweb.net/nejiwofasezemopodomelo.pdfIn PDF document text
    • https://xasopivuzag.weebly.com/uploads/1/3/5/3/135333163/lupifip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e028ba52-6c86-493e-86b7-fecf7cd1c3eb.filesusr.com/ugd/bcb9fd_5a878505043a4922a71b453c23e46b4b.pdf?index=trueIn PDF document text
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_8b58abc16e0d4caf83875ad55a87c2eb.pdf?index=trueIn PDF document text
    • https://d872ce2a-2baf-4032-ab86-ab75b2f66d52.filesusr.com/ugd/338562_b7b1e1598086488798e633bfd901317e.pdf?index=trueIn PDF document text
    • https://03ca3561-abfe-48ca-9b59-b1b2b77f8126.filesusr.com/ugd/1af49e_4e800d2f49db4db8b2fbf557bda6ac17.pdf?index=trueIn PDF document text
    • https://cd70d4e5-4a1a-4071-96d1-f2415ea5ece1.filesusr.com/ugd/7f46b5_b1c7990e2f5d42acb778a12a8f69e025.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_off0000e618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE618 5468 bytes
SHA-256: 50b99bec55bdce45ae178e1547080f187985798b3f058edcb607aa74870ce312
font_01_sfnt_off0000f895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF895 11112 bytes
SHA-256: 62521f67aabf2a00761d2c0071ba6974f677f0d43032d9572d9016c8446f74ad