Malicious PDF — malware analysis report

Static analysis result for SHA-256 63d308696909e10f…

MALICIOUS

PDF

92.8 KB Created: 2021-05-25 14:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 195da3b26b4b07e7ad921f6fb0bf1470 SHA-1: b663f881c82a801195cb29d80e898d71059b3e4f SHA-256: 63d308696909e10f5a921125c799506bbb35ccad04bd84786924c00372057bd9
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and external links are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://jottigo.ru/strik?utm_term=import+sketchup+into+fusion+360 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4411231/normal_605411f14b2e1.pdfIn PDF document text
    • https://dujomimip.weebly.com/uploads/1/3/6/0/136086420/pinorelu-vunowe.pdfIn PDF document text
    • https://katifakemu.weebly.com/uploads/1/3/1/3/131381151/b7150c0cf485.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454422/normal_6045e315ebff4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419206/normal_600a211aed0b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459481/normal_6068bba40fdfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405945/normal_6058570108c3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370064/normal_6032104b9731a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405440/normal_606e7014b2bc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469349/normal_602a143556175.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418590/normal_5fe39d0f9fd48.pdfIn PDF document text
    • https://panusefebile.weebly.com/uploads/1/3/5/3/135331690/8072501.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380869/normal_602abc8354477.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407781/normal_60153857a0b3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488315/normal_603fe8f6d9350.pdfIn PDF document text
    • https://kenazago.weebly.com/uploads/1/3/1/0/131070597/7493426.pdfIn PDF document text
    • https://fozaxuvuten.weebly.com/uploads/1/3/3/9/133986835/4a060d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365583/normal_5fe26b8f69f8d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465924/normal_5fe3da30979e2.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/43733736-8517-4799-8d29-daeec3c97fca/formato_para_hacer_una_empresa.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/jidunirelabit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4af293d7-ed34-4690-b4b0-41095bdbdcaf/how_to_clean_out_a_shark_navigator_vacuum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bc94de1-b70f-4ecf-b446-11262fc1c785/can_you_make_a_free_wordpress_website.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4404d6a9-fb61-49aa-8aa8-a865453edf27/is_tom_clancy_the_division_multiplayer.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/132349551.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/57597692363.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D45 4032 bytes
SHA-256: 9440f71eefa4f59c7a71b16fb0b9f65724f2db68f71ee41650680a98f027c4b0
font_01_sfnt_off00012bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB6 5472 bytes
SHA-256: c809bef9089cc1036900c95ccdbc121f5e9be4cfd9bd8943c681018961a9b0ec
font_02_sfnt_off00013e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E2F 11812 bytes
SHA-256: b49f6b71fa8172f88a423b0950efe8d79db364b7b41fc0d57ede064b77a30387