Malicious PDF — malware analysis report

Static analysis result for SHA-256 762b8379e586a9b6…

MALICIOUS

PDF

68.7 KB Created: 2021-05-05 23:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b073c0ba82d2034ce5af8d336f643aa2 SHA-1: 337b4cebfb4ff68e4a0fd561023ecca5f96dc4fd SHA-256: 762b8379e586a9b69ff4ea75d493e265cfebe25207901abf9a7b9aef8847a60f
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 presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML classifier score further support its malicious nature. The document body, though heavily obfuscated, appears to be related to search terms, suggesting a lure for phishing or malware distribution.

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
  • 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://vilenefex.ru/strik?utm_term=chamberlain+garage+door+wireless+keypad+installation PDF link annotation
    • https://zunitilamurako.weebly.com/uploads/1/3/4/5/134529552/b53402e.pdfIn PDF document text
    • https://taxuxonuta.weebly.com/uploads/1/3/4/8/134883444/jovojimulotin_nudefiro.pdfIn PDF document text
    • https://xopoloxunevagig.weebly.com/uploads/1/3/1/4/131406528/bf86ecd574.pdfIn PDF document text
    • https://jitolubupiloz.weebly.com/uploads/1/3/4/6/134637312/junovepononoxatutum.pdfIn PDF document text
    • https://sedezexe.weebly.com/uploads/1/3/4/3/134342112/61656cb4101d592.pdfIn PDF document text
    • https://xulijijexam.weebly.com/uploads/1/3/1/4/131453336/3591393.pdfIn PDF document text
    • https://zawanudodulir.weebly.com/uploads/1/3/1/4/131452903/6179565.pdfIn PDF document text
    • https://fawofasoz.weebly.com/uploads/1/3/1/4/131454040/wudurajosuxuvesidun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_c9e77ff3856f45af8f597f6992859df2.pdf?index=trueIn PDF document text
    • http://binuxoxu.rf.gd/82376126207.pdfIn PDF document text
    • http://menutewewunidov.rf.gd/40966772272.pdfIn PDF document text
    • https://4a0f17ac-6ce6-4c05-9546-25c48d39d9f7.filesusr.com/ugd/cd79e3_c12429a6b3c049609b6e1b4d3f9b81a3.pdf?index=trueIn PDF document text
    • https://ed8bc375-cd54-49ab-9ddb-988cb5b2fc3d.filesusr.com/ugd/3f3824_7b81a6b27f0b4d9ab2c0145643a16d5b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fead6c96-5efd-455d-8760-e0a134282116/66190710593.pdfIn PDF document text
    • http://legukekujuso.rf.gd/wuwepikis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91ae692e-8d11-4df8-84b8-6f838b64357a/how_many_carbs_are_in_taco_bell_quesadilla.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_off0000cdf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF4 5676 bytes
SHA-256: 6c0182f66f81469e0d5c36885a74cdb2635fe1fc696419512a9f5f2070d64e8d
font_01_sfnt_off0000e123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE123 10052 bytes
SHA-256: 14644a920008ffa0278c2b1bd3bedb755dc0c605c5feaa78785fee7a35fa01b0

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