Malicious PDF — malware analysis report

Static analysis result for SHA-256 0547bc5852aa404d…

MALICIOUS

PDF

60.1 KB Created: 2020-11-10 19:09:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: a6fb3348b0f2d85c41161d7979f336c5 SHA-1: 10b4919e5b6737ff814584778ae6fab01905fa3f SHA-256: 0547bc5852aa404df34210ef810ffb334bac236b29eb37dc04b2c3882459eea4
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 0.9996

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://traffking.ru/aws?keyword=miami+dade+county+clerk+of+court+forms PDF link annotation
    • https://lanasasaf.weebly.com/uploads/1/3/0/8/130815311/32dbc4343a43a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424341/normal_5f9ea50827b3f.pdfIn PDF document text
    • https://xewoxexe.weebly.com/uploads/1/3/4/3/134398473/dozijosos_janazipapazotu_mejadifaxibiv_xofakuj.pdfIn PDF document text
    • https://nudopimiga.weebly.com/uploads/1/3/1/0/131070212/demelosolajatu-xabugov.pdfIn PDF document text
    • https://xitupiwe.weebly.com/uploads/1/3/4/4/134489196/aa0a95.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/kirorafagosox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448346/normal_5f9ec9c465ede.pdfIn PDF document text
    • https://dapamokosow.weebly.com/uploads/1/3/4/3/134337633/fofarewokefozoxero.pdfIn PDF document text
    • https://vizomitula.weebly.com/uploads/1/3/4/2/134266598/1242435.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nokiwovowus/49301505171.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/angle_relationships_worksheet_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86286887-abdb-4622-b84e-af67b13d19d9/factory_direct_jewelry_exchange.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/kinuzenejogawenijilaw.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_off0000b099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB099 5340 bytes
SHA-256: 8682f972b51944e175820c101792cdd05da258c6c77a4315be23dc1c4de3eb08
font_01_sfnt_off0000c2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C4 9672 bytes
SHA-256: 34232c3d83d0151f0dc77aea449b2a7ebd6195b9ff154900ec4807d01bbb443d