Malicious PDF — malware analysis report

Static analysis result for SHA-256 efbdb96eb6fff94f…

MALICIOUS

PDF

73.1 KB Created: 2020-12-27 09:57:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 01abe991a015e11802f1e0d93361e257 SHA-1: b50bcb36755387bca8f63c746f3c901ff0493a3b SHA-256: efbdb96eb6fff94f0da76bbf114d035fb6d5ba71c608b12ce3d7b43ca7c409ea
244 Risk Score

Malware Insights

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

This PDF document is classified as malicious and contains a large number of embedded links, forming a link farm. One of the primary links directs to a known malicious redirector, suggesting an attempt to lead users to harmful content. The document's structure and numerous external links indicate a phishing or spam distribution tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/strik?utm_term=cartoon+boy+wallpaper+hd+for+mobile In PDF document text
    • https://botekajerojaj.weebly.com/uploads/1/3/4/7/134749353/jafexojakesu.pdfIn PDF document text
    • https://wegonugu.weebly.com/uploads/1/3/4/0/134040733/wexeperipezega.pdfIn PDF document text
    • https://tarirubawapub.weebly.com/uploads/1/3/1/6/131606173/8083539.pdfIn PDF document text
    • https://dokakida.weebly.com/uploads/1/3/1/3/131380589/kavunowasat-wijorapurexeso.pdfIn PDF document text
    • https://fiwugepupuladav.weebly.com/uploads/1/3/4/7/134740110/kunevugopa_nejol_rusofilid_vinugusi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368770/normal_5f8b27da28438.pdfIn PDF document text
    • https://jaserasozupog.weebly.com/uploads/1/3/1/4/131454215/1074766.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501993/normal_5fc8cf4d135c9.pdfIn PDF document text
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/9373972.pdfIn PDF document text
    • https://tixusevonatafix.weebly.com/uploads/1/3/4/6/134611731/lozewabifap.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/af9c92f7-8868-4237-a6d9-30b510295e94/birizunugafepufinumaridi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/657aa550-7851-4ead-b14a-fae75c91e68e/32802056594.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/intermec_bartender_ultralite.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/sample_of_acknowledgements_in_a_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a1fea71-b9c8-47f8-8f9d-ef0788dce3c3/fixewiwa.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_off0000e122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE122 5344 bytes
SHA-256: 24eb9eaee52fa9ee11e60133fbc695fbd24e69c9f2020bf972a0b9a4dd9d3568
font_01_sfnt_off0000f334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF334 10696 bytes
SHA-256: ceeb49160a37ea8830d6aa7adcaf753f77d13e249da99c032ccd4ac19aaac090

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