Malicious PDF — malware analysis report

Static analysis result for SHA-256 43f1b6b0c3716aa0…

MALICIOUS

PDF

95.2 KB Created: 2021-03-15 15:29:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 68a3f0878f6625a80223402cf50df3b1 SHA-1: 9d005fb355c1ef6c838fb48f8fc5e2e8e239cf84 SHA-256: 43f1b6b0c3716aa0a5e83ebdce95acf61b1247c84a225ee395dd026a6d07f44a
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 0.9997

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://bologen.ru/wix?keyword=go+math+grade+4+chapter+13+lesson+13.1 PDF link annotation
    • https://jofufibiwew.weebly.com/uploads/1/3/5/3/135347649/9494819.pdfIn PDF document text
    • http://sipipewawezizuf.getenjoyment.net/6252738916.pdfIn PDF document text
    • https://dolojimopa.weebly.com/uploads/1/3/4/8/134887070/matoxujodukopi_tudamow_tukibizisabev_sulaxexovuk.pdfIn PDF document text
    • http://sezugoramilepep.22web.org/86180026015.pdfIn PDF document text
    • https://sukaxivex.weebly.com/uploads/1/3/4/8/134895869/8081672.pdfIn PDF document text
    • http://nosadowatipuwaw.iblogger.org/apartment_amenities_list.pdfIn PDF document text
    • http://rivepozepuxar.mywebcommunity.org/88880820677.pdfIn PDF document text
    • https://risibazizugati.weebly.com/uploads/1/3/4/7/134710005/9323591.pdfIn PDF document text
    • https://fogunovavak.weebly.com/uploads/1/3/2/6/132681822/zamagaranivus.pdfIn PDF document text
    • http://rawutunulodewo.iblogger.org/best_bed_sheet_fabric.pdfIn PDF document text
    • https://sizelelam.weebly.com/uploads/1/3/4/8/134867910/dujesup_rubatijo.pdfIn PDF document text
    • http://dikegebe.mygamesonline.org/fofad.pdfIn PDF document text
    • https://tidepobowajaxuk.weebly.com/uploads/1/3/0/8/130814761/lunadatava_moxivawarinane.pdfIn PDF document text
    • https://funugunuxu.weebly.com/uploads/1/3/4/3/134384448/xirutu.pdfIn PDF document text
    • https://sagiwotagemo.weebly.com/uploads/1/3/1/8/131871993/viwojekuzubi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb70d8ad-9950-4e77-a124-96ac8cfdda66/ielts_cambridge_9_listening_test_1.pdfIn PDF document text
    • http://mogopubu.epizy.com/8007924605.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e010f90d-611f-47f8-8cfe-85430c58a90d/wofisudumeri.pdfIn PDF document text
    • http://puzujudu.rf.gd/30320705710.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ce66101-9f0a-4a76-a967-da58b7b5ab63/69706771348.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC5 5856 bytes
SHA-256: 0a74105cb1307c0766bcfc39ff6647e803fc674d51b246ff8315baf95250cece
font_01_sfnt_off00013296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13296 11448 bytes
SHA-256: 64126f403deaf6112c8ee81dda3858c74652f0f45cb2d8da57564be6e1c94863
font_02_sfnt_off000159c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159C5 16096 bytes
SHA-256: 3a87a2a80cb0740ff7ad33dbd9b35031d90241dfccc5ab96a3d2c3133af9c3ca