Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6e320f8bf61b1ff…

MALICIOUS

PDF

67.1 KB Created: 2020-12-18 12:50:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 5bbe8655dd6eda345a9ff6420e760c27 SHA-1: ee80c045128e69213b0fc9ff6b74823a4725be36 SHA-256: a6e320f8bf61b1ffa3480f00bd82c8c24c4114d3ca3a45115ff24c899c7fa020
156 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 weebly.com, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, contains text related to 'Vex 3 unblocked weebly', indicating a lure to attract users searching for this term. The presence of PDF_SEO_LINK_FARM and PDF_URI heuristics, along with numerous unknown reputation URLs, strongly supports this phishing and link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://trafffi.ru/123?utm_term=vex+3+unblocked+weebly PDF link annotation
    • https://xovatikawe.weebly.com/uploads/1/3/4/7/134726086/musutixitavik_ganiwe_kanuraza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379045/normal_5fd329c9b4fd7.pdfIn PDF document text
    • https://lovaxases.weebly.com/uploads/1/3/4/6/134685664/mipebotoladedux.pdfIn PDF document text
    • https://kuvenamowafave.weebly.com/uploads/1/3/1/3/131379608/nizuxidobesovi.pdfIn PDF document text
    • https://fesitafixob.weebly.com/uploads/1/3/4/6/134653549/a4f1deb8def1.pdfIn PDF document text
    • https://bexusisase.weebly.com/uploads/1/3/4/5/134596812/068af8bccdd79b.pdfIn PDF document text
    • https://xakediripikevul.weebly.com/uploads/1/3/4/3/134338645/5809212.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static1.squarespace.com/static/5fce0b02c83faa584acdbba3/t/5fd6925eab7772717696b12a/1607897695572/csgo_crosshair_generator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37f13d9a-6226-41a2-b1a2-fbc2251a1329/rexofelexobokowobopareli.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/jikuvekisemidurenesire.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/ralirolixur.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc11c78f7cf8c75402c31d1/t/5fc5f692f8cdb769c6b1102b/1606809237075/murad_skin_perfecting_lotion_allergic_reaction.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/84938209155.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/18879157696.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_off0000bf57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF57 4800 bytes
SHA-256: 756530e5f1545a24c47fd6931fe48659ae99818fe9f58760494082b595801200
font_01_sfnt_off0000cfc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC8 9920 bytes
SHA-256: 37fd002d193cf0399bc3fc91ab94e51d8f89e1e328a5b9a3e732b716e8242a93
font_02_sfnt_off0000f1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C1 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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